From aaharony at bgu.ac.il Tue Jan 1 11:57:45 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-07 Condensed Matter Seminar Message-ID: <200801010957.LAA50359920@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 07-01-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: No seminar today, see http://www.weizmann.ac.il/conferences/QuantumNoise/ SPEAKER: , ABSTRACT/COMMENTS: From idobd at bgu.ac.il Tue Jan 1 13:12:01 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-02 Particles and Fields Seminar Message-ID: <200801011112.NAA51726206@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 02-01-2008 TIME: 12:00pm (Wed) PLACE: Physics building (#54) room 207 TITLE: Planar Equivalence:From Type 0 Strings to QCD Equivalence SPEAKER: Adi Armoni, Swansea University, UK ABSTRACT/COMMENTS: Notice that the seminar is on the astrophysics seminar time and place. From dcohen at bgu.ac.il Tue Jan 1 15:08:18 2008 From: dcohen at bgu.ac.il (Cohen Doron) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-03 Physics Colloquium Message-ID: <477A3B42.7090603@bgu.ac.il> Physics Colloquium DATE: 03-01-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Stochastic simulations of genetic regulatory networks in cells SPEAKER: Prof. Ofer Biham, Dept of Physics, Hebrew University Jerusalem ABSTRACT/COMMENTS: Extensive effort in the field of systems biology in recent years has focused on the analysis of cellular networks. These networks consist of interacting genes, which regulate each other\'s expression. Recent studies have shown that these networks are typically sparse and include recurring modules or motifs. To analyze the function of genetic networks, one needs to simulate their dynamics. Since the networks often exhibit strong fluctuations, stochastic methods, based on the master equation, are required. In this talk I will consider a class of genetic modules such as the toggle switch [1,2], the mixed feedback loop and the repressilator. Some of these modules include only transcriptional regulation, while others also include post-transcriptional regulation by small non-coding RNAs [3] and post-translational regulation by protein-protein interactions. I will show that in modules which include feedback, fluctuations give rise to crucial quantitative and qualitative effects. More complete understanding of the function of genetic networks will require to simulate large complex networks, which consist of many interacting modules. While direct integration of the master equation is suitable for the analysis of small modules, it becomes infeasible in the case of complex networks, because the number of equations increases exponentially with the number of genes in the network. As a potential solution to this problem, I will present the multi-plane method [4]. This method has been used for chemical networks, where it provides a dramatic reduction in the number of equations and enables to perform stochastic simulations of complex reaction networks. Current efforts are aimed at extending the method to the more general reaction processes and interactions which appear in genetic networks. [1] A. Lipshtat, A. Loinger, N.Q. Balaban and O. Biham, Genetic toggle switch without cooperative binding, Phys. Rev. Lett. 96, 188101 (2006). [2] A. Loinger, A. Lipshtat, N.Q. Balaban and O. Biham, Stochastic simulations of genetic switch systems, Phys. Rev. E 75, 021904 (2007). [3] Y. Shimoni, G. Friedlander, G. Hetzroni, G. Niv, S. Altuvia, O. Biham and H. Margalit, Regulation of gene expression by small non-coding RNAs: a quantitative view, Molecular Systems Biology 3, 138 (2007). [4] A. Lipshtat, O. Biham, Efficient simulations of gas-grain chemistry in interstellar clouds, Phys. Rev. Lett. 93, 170601 (2004). From dcohen at bgu.ac.il Tue Jan 1 15:09:27 2008 From: dcohen at bgu.ac.il (Cohen Doron) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-02 nanotechnology workshop Message-ID: <477A3B87.5040402@bgu.ac.il> Nanotechnology workshop, Wednesday January 2, 12:00 building 29, room 306,Chemistry Department seminar room Title : Mechanical Model for Self-Polarization of Cells Speaker: Assaf Zemel Department of Materials and Interfaces Weizmann Institute From nano at bgu.ac.il Wed Jan 2 09:39:49 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-02 nanotechnology workshop Message-ID: <000f01c84d12$a7d36be0$1b0e4884@estinano> ----- Original Message ----- From: Nano To: nano Sent: Monday, December 31, 2007 12:51 PM Subject: 2008-01-02 nanotechnology workshop Nanotechnology workshop, Wednesday January 2, 12:00 building 29, room 306,Chemistry Department seminar room Title : Mechanical Model for Self-Polarization of Cells Speaker: Assaf Zemel Department of Neurobiology, Physiology, and Behavior, University of California Davis, USA -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080102/bb3d0b39/attachment.htm From ibar at bgu.ac.il Wed Jan 2 10:12:02 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-08 Lasers Seminar Message-ID: <20080102075809.AD6C033E62@smtp2.bgu.ac.il> Lasers Seminar DATE: 08-01-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Measuring and controlling attosecond processes SPEAKER: Dr. Nirit Dudovich, Department of Complex Systems, Weizmann Institute of Science Rehovot 71600 ABSTRACT/COMMENTS: Lasers Seminar DATE: 08-01-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Measuring and controlling attosecond processes SPEAKER: Dr. Nirit Dudovich, Department of Complex Systems, Weizmann Institute of Science Rehovot 71600 ABSTRACT/COMMENTS: The interaction of intense light with atoms or molecules can lead to the generation of XUV pulses and energetic electron pulses with attosecond duration. The advent of attosecond technology opens new fields of time resolved studies in which the observation of fast electronic dynamics can be attained. The study of new areas of science, such as time resolved measurements of multi-electron dynamics and imaging molecular and nuclear dynamics, has consequently become accessible. In this talk I will present a novel approach to attosecond measurement and control. In this scheme the attosecond generation process is probed or manipulated during its occurrence. This capability is then applied to probe the spatial structure of an atomic wave function. I will describe how we measure the spatio-temporal properties of the wavefunction with Angstrom and attosecond accuracy. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080102/12cb0195/attachment.htm From ibar at bgu.ac.il Wed Jan 2 10:14:10 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-08 Lasers Seminar Message-ID: <20080102080017.6EB1533E77@smtp2.bgu.ac.il> Lasers Seminar DATE: 08-01-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Measuring and controlling attosecond processes SPEAKER: Dr. Nirit Dudovich, Department of Complex Systems, Weizmann Institute of Science Rehovot, 71600 ABSTRACT/COMMENTS: The interaction of intense light with atoms or molecules can lead to the generation of XUV pulses and energetic electron pulses with attosecond duration. The advent of attosecond technology opens new fields of time resolved studies in which the observation of fast electronic dynamics can be attained. The study of new areas of science, such as time resolved measurements of multi-electron dynamics and imaging molecular and nuclear dynamics, has consequently become accessible. In this talk I will present a novel approach to attosecond measurement and control. In this scheme the attosecond generation process is probed or manipulated during its occurrence. This capability is then applied to probe the spatial structure of an atomic wave function. I will describe how we measure the spatio-temporal properties of the wavefunction with Angstrom and attosecond accuracy. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080102/abb55ebb/attachment.htm From nano at bgu.ac.il Wed Jan 2 12:28:20 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-09 nanotechnology workshop Message-ID: <008701c84d2a$32760660$1b0e4884@estinano> Nanotechnology workshop, Wednesday January 9, 12:00 building 29, room 306,Chemistry Department seminar room Title : Optical and Magnetic Properties of Colloidal Nanocrystals Speaker: Gil Markovich School of Chemistry, Tel Aviv University Abstract: Two studies that involve interesting properties of colloidal nanocrystals will be presented: 1.. Magnetism in HfO2 nanorods ? Several years ago, Coey and coworkers have discovered that thin films of HfO2, which is known to be diamagnetic, develop ferromagnetic properties when deposited on various substrates. We have studied the occurrence of this phenomenon in small HfO2 nanorods prepared by colloidal synthesis and were able to control this ferromagnetism by controlling the defect concentration in the nanorods through control of synthesis parameters. 2.. Optical properties ? we study the interaction of chiral (bio-)molecules with noble metal nanocrystals ? induction of chirality in metal particles and enhancement of circular dichroism spectra of such molecules by surface plasmon resonance of small metal particles. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080102/abbfb52b/attachment.htm From idobd at bgu.ac.il Thu Jan 3 16:09:58 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-09 Particles and Fields Seminar Message-ID: <200801031409.QAA54907618@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 09-01-2008 TIME: 10:00am (Wed) - Notice the different day! PLACE: Physics building (#54) room 207 TITLE: Tabletop ads/cft: black holes and superconductors SPEAKER: Sean Hartnoll, KITP, USBC ABSTRACT/COMMENTS: The AdS/CFT correspondence provides a novel window into 2+1 dimensional condensed matter systems near quantum critical points. I will discuss applications of AdS/CFT to recent measurements of thermoelectric transport in high temperature superconductors. From idobd at bgu.ac.il Sun Jan 6 10:38:41 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-07 Particles and Fields Seminar Message-ID: <200801060838.KAA59067264@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 07-01-2008 TIME: 10:00am (Mon) PLACE: Physics building (#54) room 207 TITLE: Fayet-Iliopoulos D-terms in open string theory SPEAKER: Albion Lawrence, Brandeis University ABSTRACT/COMMENTS: From physics at bgu.ac.il Sun Jan 6 13:21:58 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-10 Physics Colloquium Message-ID: <200801061121.NAA58958913@tzin.bgu.ac.il> Physics Colloquium DATE: 10-01-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Bad Superconductors SPEAKER: Prof. Dan Shahar, Dept. of Physics Weizmann Institute, Rehovot ABSTRACT/COMMENTS: In this talk I will describe our studies of highly disordered superconductors. The disorder level in these materials is so high that superconductivity is hardly maintained. Perhaps the most surprising consequence of being on the verge of losing superconductivity, is that the resulting state is a strong insulator, rather than a normal conductor. We will establish the relation between this insulating state and the superconductor, and contemplate its consequences. From nano at bgu.ac.il Mon Jan 7 09:23:57 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-07 Department of Materials Engineering seminar Message-ID: <002201c850fe$44bc1030$1b0e4884@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: =?windows-1255?B?8e7p8Pgg4frg+OnqIDcuMS4wOC5kb2M=?= Type: application/msword Size: 39424 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080107/5aea9440/windows-1255B8e7p8Pgg4frgOnqIDcuMS4wOC5kb2M.dot From aaharony at bgu.ac.il Mon Jan 7 09:44:00 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2007-01-14 Condensed Matter Seminar Message-ID: <200801070744.JAA60600188@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 14-01-2007 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Counting statistics in closed mesoscopic systems SPEAKER: Maya Chuchem, Physics Department, Ben Gurion Univwersity ABSTRACT/COMMENTS: The amount $Q$ of particles that are transported via a path of motion is characterized by its expectation value $\\langle Q \\rangle$ and by its variance $\\mbox{Var}(Q)$. We analyze what happens if a particle has two optional paths available to get from one site to another site, and in particular what is $\\mbox{Var}(Q)$ for the current which is induced in a quantum stirring device. It turns out that coherent splitting and the stirring effect are intimately related and cannot be understood within the framework of the prevailing probabilistic theory. From ibar at bgu.ac.il Tue Jan 8 17:09:59 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-15 Lasers Seminar Message-ID: <20080108145534.8578333E78@smtp2.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 15-01-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: On the Shape of the Photon SPEAKER: Prof. Yaron Silberberg, Physics of Complex Systems, Weizmann Institute of Science, Rehovot ABSTRACT/COMMENTS: Quantum coherent control is an elegant method for driving quantum systems through quantum interferences. The most successful experimental approach to date has used carefully synthesized femtosecond pulses as the driving field. Starting with simple examples of atomic systems, I shall demonstrate how pulse shaping can be applied to control such systems in nontrivial, often surprising ways, even though the quantum levels are many orders of magnitude narrower than the light spectrum. I shall then discuss how control can be extended to nonclassical light, and in particular show how one can use pulse shaping tools on single-photon sources. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080108/7311e217/attachment.htm From avivaf at bgu.ac.il Wed Jan 9 09:11:47 2008 From: avivaf at bgu.ac.il (avivaf@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-09 Astrophysics and Cosmology Seminar Message-ID: <200801090711.JAA63474998@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 09-01-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: Solar wind interaction with non-magnetized planets (Venus and Mars) SPEAKER: Prof. M. Gedalin, Physics Dept., BGU ABSTRACT/COMMENTS: The interaction of the solar wind with magnetized planets (like Earth) has been extensively studied. The formation of the Earth-like magnetospheres and the basic features of these magnetospheres are believed to be understood. In contrast with magnetized planets, Mars and Venus, which do not have a global magnetic field, are not magnetic obstacles for the solar wind. Nevertheless, due to the conducting ionospheres both planets form magnetospheres, which are surprisingly similar to the Earth magnetosphere (in their outer parts). A brief outline of the formation of the bow shock and \"magnetosheath\" at these planets will be given along with the features and processes which are not understood at present (nearly everything). An example of recent observations of a peculiar Venusian bow shock will be presented and interpreted as a direct evidence of collisionless processes at the shock front. From idobd at bgu.ac.il Wed Jan 9 09:20:51 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2007-01-09 Particles and Fields Seminar Message-ID: <200801090720.JAA63583653@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 09-01-2007 TIME: 11:00 a.m. (Wed.) PLACE: Physics building (#54) room 207 TITLE: Tabletop ads/cft: black holes and superconductors (Wed. 11:00 a.m.-TIME CHANGED) SPEAKER: Sean Hartnoll, KITP/UCSB ABSTRACT/COMMENTS: The AdS/CFT correspondence provides a novel window into 2+1 dimensional condensed matter systems near quantum critical points. I will discuss applications of AdS/CFT to recent measurements of thermoelectric transport in high temperature superconductors. From idobd at bgu.ac.il Thu Jan 10 14:38:22 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-14 Particles and Fields Seminar Message-ID: <200801101238.OAA65207831@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 14-01-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: DOUBEL FEATURE: Moduli stabilisation via quantum corrections AT 10 A.M Wilson loops in supersymmetric YM in 4d, in pure YM in 2d and in 0d AT 1 P.M. SPEAKER: Carlo Angelantonj^ Nadav Drukker*, ^ - Turin University *- Humboldt University, Berlin ABSTRACT/COMMENTS: There are two talks. The first one is in the usual time- 10 a.m. by Carlo Angelantonj about moduli stabilization. The second one is at 1 p.m. by Nadav Drukker about Wilson loops in SYM theories. From aaharony at bgu.ac.il Mon Jan 14 11:14:22 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-21 Condensed Matter Seminar Message-ID: <200801140914.LAA71335592@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 21-01-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Converging theoretical perspectives on charge pumping SPEAKER: Dr. Vyacheslavs Kashcheyevs , University of Latvia, Riga ABSTRACT/COMMENTS: Pumping can be broadly defined as charge redistribution between unbiased remote reservoirs caused by external periodic perturbation of a finite device. Pumping through nanostructures has appeal both for fundamental research (as a probe for quantum and correlation effects) and for metrological applications (as a potential accurate current source). I shall review several frameworks being used for theoretical description of pumping and discuss the challenges faced -- quantum interference, Coulomb interaction and non-adiabaticity. (Not so) different mechanisms leading to pumped charge quantization (namely, the delivery of an accurate number of electrons per cycle) will be discussed. Recent theoretical and experimental progress on a novel single-parameter non-adiabatic quantized electron pump, developed at Germany metrology institute (PTB), will serve as an example illustrating general concepts. From physics at bgu.ac.il Mon Jan 14 13:09:24 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-17 Physics Colloquium Message-ID: <200801141109.NAA71363651@tzin.bgu.ac.il> Physics Colloquium DATE: 17-01-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Single particle interference away from the linear regime SPEAKER: Moty Heiblum , Department of Condensed Matter Physics, Weizmann Institute of Science ABSTRACT/COMMENTS: Single particle interference is a well understood phenomenon. Interferometers in the linear regime were used to determine coherence length, to measure phase evolution in coherent systems, and to study statistics of particles. However, away from the linear regime, we found a peculiar behavior. The interference vanished for certain energies, corresponding approximately to the presence of a small integer number of electrons in the interferometer. Extensive measurements with an \'electronic mach zehnder interferometer\' allowed us to show that the unexpected behavior results from electron-electron interactions, but in a rather complicated way, which is yet not fully understood. Refreshments are served at 3:20pm From aaharony at bgu.ac.il Mon Jan 21 13:42:07 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-02-04 Condensed Matter Seminar Message-ID: <200801211142.NAA81827780@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 04-02-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Lateral Interactions on Surfaces: An Empirical Perspective SPEAKER: Gil Alexandrowitcz, Cavendish Laboratory, University of Cambridge, Cambridge, UK ABSTRACT/COMMENTS: Lateral forces between surface atoms and molecules play a critical role in a wide variety of surface related phenomena. Examples include thin film growth, industrial catalysis, and the assembly of nanostructures. Direct experimental data for the nature and the magnitude of these forces was typically unavailable, and simplifying assumptions were made both to deduce these interactions from indirect macroscopic measurements and to include them in numerical models of surface systems. The recently developed helium spin echo spectrometer[1], has the unique capability to measure both surface motion and lateral interactions on an atomic length scale and on a pico to nano-second time scale[2]. In this talk I will describe how this instrument is used to measure lateral interactions and present recent results obtained for the strongly interacting surface system CO/Pt(111). Surprisingly, we find that the standard surface science approximations completely fail to describe this prototypical system and that the interactions between the CO molecules are of a complex many body nature. [1] AP Jardine et. al. Science 305, 1790 (2004). [2] G Alexandrowicz et. al. Phys. Rev. Lett. 97, 156103(2006). From physics at bgu.ac.il Tue Jan 22 12:56:54 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-01-30 Astrophysics and Cosmology Seminar Message-ID: <200801221056.MAA83474278@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 30-01-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: The Diamagnetic Effect as a Shared Factor for Cooling Sunspots, Coronal Heating, as well as Imparting Momentum to the High Speed Solar Wind SPEAKER: Netzach Farbiash , (in partial fulfillment of PhD studies requirements) ABSTRACT/COMMENTS: The sun exhibits a large variety of physical phenomena. Among them, we find cold spots, a hot corona, and a high speed solar wind. A variety of explanations were suggested during the last decades to explain these phenomena; some are perhaps able to explain part of the physical processes, but there is not one unique theory to account for all three phenomena. Here we study the consequences of the presence of diamagnetic effects combined with gravity as a shared factor to cool sunspots, heat the corona, as well as impart momentum to the high speed solar wind. We first describe three puzzles as they are observed on the Sun. Next, we follow the motion of charged particles in the presence of both gravity and (geometrically) diverging magnetic fields. We show that this combination acts as a \"speed filter\", modifying the atmospheric structure. Essentially, we argue that these \"speed filters\" siphon heat and momentum from certain regions into the chromosphere and corona (becoming sunspots). In addition, we study the contribution of Coulomb collisions to the filtering effect. Our finding that the diamagnetic effect combined with gravity changes Maxwellian distribution into a Non-Maxwellian one is relevant for Cooling Sunspots, Coronal Heating, as well as Imparting Momentum to the High Speed Solar Wind, and also to other observed phenomena. From physics at bgu.ac.il Mon Feb 4 15:29:34 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:28 2009 Subject: [Phys-seminars] 2008-02-12 Special Seminar Message-ID: <200802041329.PAA102330239@tzin.bgu.ac.il> Special Seminar DATE: 12-02-2008 TIME: 10:00am (Tue) PLACE: Physics building 54 room 207 TITLE: RHK Technology and Scanning Probe Microscopy The Latest advances in SPM and controller technology SPEAKER: Mr. Adam Kollin, ABSTRACT/COMMENTS: The rise in prominence for Scanning Probe Microscopies (STM, AFM, NSOM, MFM, KFM, etc.) has proceeded in parallel with the growth of RHK Technology. Throughout two decades of side-by-side growth, RHK has continually advanced the forefront of new developments in the field. As one of the world’s leading manufacturers of UHV SPM systems, RHK delivers best-in-class performance in both hardware and control system technology. Scientists on the cutting edge of technology have relied on the flexibility and versatility of RHK’s open design philosophy along with in-depth customer support. This presentation will provide an overview of cutting edge results by RHK users along with a preview of upcoming new products and capabilities including: - Cryogenic Four Probe STM - Millikelvin UHV STM/AFM - Integrated AFM/STM/SEM - PLLPro II - Zero Drift Spectroscopy Mr. Kollin founded RHK Technology in 1979 and has served as President since that time. The company has grown to over 40 employees, over half of which are physicists, electrical, mechanical and software engineers. As a strong supporter of Israel, RHK Technology offers all of its products to Israeli researchers at 40–60% below the prices sold in other parts of the world. From physics at bgu.ac.il Sun Feb 10 09:20:40 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-02-11 Special Seminar Message-ID: <200802100720.JAA110720688@tzin.bgu.ac.il> Special Seminar DATE: 11-02-2008 TIME: 14:00 PLACE: חדר סמינרים 207, בנין 54 TITLE: מערכת נידוף בלייזר לשכבות דקות SPEAKER: Dr. J. Kim , Ph.D. , Neocera, USA ABSTRACT/COMMENTS: From physics at bgu.ac.il Sun Feb 10 09:51:59 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-02-11 Special Seminar Message-ID: <200802100751.JAA112410766@tzin.bgu.ac.il> Special Seminar DATE: 11-02-2008 TIME: 14:00 PLACE: Seminars room 207, Building 54 TITLE: Pulsed Laser Deposition System SPEAKER: Dr. J. Kim, Ph.D, Neocera, USA ABSTRACT/COMMENTS: From idobd at bgu.ac.il Sun Feb 24 18:41:28 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-02-25 Particles and Fields Seminar Message-ID: <200802241641.SAA132929654@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 25-02-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Introduction to D-branes SPEAKER: Ilya Gurwich, Ben-Gurion University ABSTRACT/COMMENTS: Sorry for the last moment notice. It is an introductory lecture to the topic of D-branes. From gideonc at bgu.ac.il Mon Feb 25 16:35:38 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-13 Special Colloquium Message-ID: <200802251435.QAA135422209@tzin.bgu.ac.il> Special Colloquium DATE: 13-03-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Precision measurements with alkali-metal atoms SPEAKER: Prof. Michael Romalis, Department of Physics, Princeton University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq0708_A/Romalis.html Refreshments are served at 3:20pm From nano at bgu.ac.il Wed Feb 27 10:09:11 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-05 nanotechnology workshop Message-ID: <009001c87918$093fa0c0$1b0e4884@estinano> Nanotechnology workshop, Wednesday March 5, 12:00 building 29, room 306,Chemistry Department seminar room Title : Self-organization of complex nanotube patterns on crystals surfaces Speaker: Ernesto Joselevich Department of Materials and Interfaces Weizmann Institute of Science Abstract: The organization of carbon nanotubes into ordered geometries and arrays on surfaces is a critical prerequisite for their large-scale integration into nanocircuits. We have elaborated a series of surface-directed mechanisms of carbon nanotube growth, which can be classified as different modes of orientational epitaxy. These epitaxial modes of carbon nanotube growth include lattice-directed epitaxy (by atomic rows), ledge-directed epitaxy (by atomic steps) [1], and graphoepitaxy (by nanofacets) [2]. Some of these epitaxial modes can be simultaneously combined with electric field-directed growth [3] for the orthogonal self-assembly of carbon nanotube crossbar architectures [4]. Nanotube epitaxy on different crystal surfaces yields unprecedented geometries, including highly straight [1,2], kinked [1], wavy [2], crossbar [4], serpentine [5], coiled [5], and more. [1] A. Ismach, L. Segal, E. Wachtel & E. Joselevich, Angew. Chem. Int. Ed. 2004, 43, 6140. [2] A. Ismach, D. Kantorovich & E. Joselevich, J. Am. Chem. Soc. 2005, 127, 11554. [3] E. Joselevich & C. M. Lieber, Nano Lett. 2002, 2, 1137. [4] A. Ismach & E. Joselevich, Nano. Lett. 2006, 6, 1706. [5] N. Geblinger, A. Ismach & E. Joselevich, Nature Nanotechnology 2008, in press. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080227/95ea001d/attachment.htm From ibar at bgu.ac.il Sat Mar 1 22:07:12 2008 From: ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-04 Lasers Seminar Message-ID: ANNOUNCEMENT==> Special Lasers Seminar DATE: 04-03-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Ultrafast XUV pulses ? dynamics beyond conventional fs lasers SPEAKER: Dr. Daniel Strasser, Departments of Chemistry and Physics, UC Berkley ABSTRACT: I will describe experimental studies aimed at extending our ability to probe ultrafast molecular dynamics. Ultrafast extreme ultraviolet (XUV) pulses are produced by high order harmonic generation and are used, in time delayed coincidence with fs laser pulses, to investigate dissociation dynamics. Two experimental approaches are presented, demonstrating the advantages of ultrafast XUV pulses for both probing and initiating molecular dynamics. Transient valence photoelectron binding energy spectra are obtained from a dissociative Br2* wavepacket and analyzed to reveal the excited state binding energy spectrum as well as small chemical shifts of nearly dissociated Br atoms.1 In a separate study, ultrafast XUV pulses are used to excite dynamics on a superexcited state of molecular nitrogen. The competition of predissociation and autoionization decay channels is probed by detection of N* predissociation products. Surprisingly highly excited N* products are identified and their rise time is determined to be faster than an upper limit of 25 fs.2 1 D. Strasser, F. Goulay, and S. R. Leone, J. Chem. Phys. 127, 184305 (2007). 2 D. Strasser, L. H. Haber, B. Doughty and S. R. Leone, Mol. Phys. in press (2008). Prof. I. Bar Department of Physics Ben-Gurion University of the Negev Beer Sheva 84105 ISRAEL? -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080301/b7ef78c0/attachment.htm From physics at bgu.ac.il Sun Mar 2 09:53:47 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-13 Physics Colloquium Message-ID: <200803020753.JAA362968@tzin.bgu.ac.il> Physics Colloquium DATE: 13-03-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Precision measurements with alkali-metal atoms SPEAKER: Prof. Michael Romalis, Department of Physics, Princeton University ABSTRACT/COMMENTS: Alkali-metal atoms with well-controlled degrees of freedom provide an ideal system for high sensitivity measurements, used, for example, in atomic clocks. I will discuss recent advances in precision measurements using spin-polarized alkali-metal atoms, focusing on their use for detection of weak magnetic fields and searches for physics beyond the Standard Model. The sensitivity of these measurements depends crucially on the electron spin coherence time which is usually limited by atomic collisions. Careful analysis of the collision properties allows one to choose operating regimes where the spin coherence time is increased by several orders of magnitude. With these improvements atomic magnetometers are now surpassing cryogenic SQUID magnetometers which have long been considered most sensitive magnetic field sensors. Higher sensitivity and absence of cryogens open new applications for atomic magnetometers, including detection of nuclear magnetic resonance signals and magnetic fields generated by the brain. For fundamental physics tests, we developed a noble gas- alkali-metal co-magnetometer with two spin species occupying the same volume, which allows one to cancel ordinary magnetic fields while retaining sensitivity to exotic effects beyond the Standard Model. Such arrangement is being used to search for Lorentz-violating spin couplings, spin-dependent forces and a CP-violating permanent electric dipole moment. From aaharony at bgu.ac.il Mon Mar 3 12:54:50 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-10 Condensed Matter Seminar Message-ID: <200803031054.MAA450422@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 10-03-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Phonon Observation by Transport Measurement in T-shaped Double Quantum Dots SPEAKER: Dr. Akiko Ueda, Keio University, Japan ABSTRACT/COMMENTS: In electronic transport through quantum dots under finite bias at temperature $T=0$, phonon emission results in the dephasing of electrons. We theoretically examine such dephasing in T-shaped double quantum dots, in which one dot (dot 1) is connected to external leads and the other (dot 2) is disconnected from the leads. We calculate transport properties under finite bias with electron-phonon (e-ph) interaction using Keldysh Green function method. In the absence of e-ph interaction, $dI/dV$ shows the dip due to the destructive interference between an electron wave passing by the interdot bonding orbital and that passing by the interdot anti-bonding orbital. Phonon emission from dot 1 does not influence the dip since it does not result in dephasing. The phonon emission from dot 2, on the other hand, breaks the interference and reduces the dip. We find that the decrease in the dip reflects the phonon spectrum in the system as a function of the bias voltage. From aaharony at bgu.ac.il Mon Mar 3 15:08:58 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-24 Condensed Matter Seminar Message-ID: <200803031308.PAA460940@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 24-03-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Phonon Observation by Transport Measurement in T-shaped Double Quantum Dots --NOTE NEW DATE SPEAKER: Dr. Akiko Ueda, Keio University, Japan ABSTRACT/COMMENTS: In electronic transport through quantum dots under finite bias at temperature $T=0$, phonon emission results in the dephasing of electrons. We theoretically examine such dephasing in T-shaped double quantum dots, in which one dot (dot 1) is connected to external leads and the other (dot 2) is disconnected from the leads. We calculate transport properties under finite bias with electron-phonon (e-ph) interaction using Keldysh Green function method. In the absence of e-ph interaction, $dI/dV$ shows the dip due to the destructive interference between an electron wave passing by the interdot bonding orbital and that passing by the interdot anti-bonding orbital. Phonon emission from dot 1 does not influence the dip since it does not result in dephasing. The phonon emission from dot 2, on the other hand, breaks the interference and reduces the dip. We find that the decrease in the dip reflects the phonon spectrum in the system as a function of the bias voltage. From idobd at bgu.ac.il Mon Mar 3 22:49:07 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-10 Particles and Fields Seminar Message-ID: <200803032049.WAA487999@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 10-03-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Continuous Axion Photon Duality, Axion Photon Oscillations, Solitons and Splitting SPEAKER: Eduardo Guendelman, BGU ABSTRACT/COMMENTS: The axion photon system in an external magnetic field, when for example considered with the geometry of the experiments exploring axion photon mixing (which can be represented by a 1+1 effective model) displays a continuous axion-photon duality symmetry in the limit the axion mass is neglected. The conservation law that follows from this symmetry is obtained. The magnetic field interaction is seen to be equivalent to first order to the interaction of a complex charged field with an external electric potential, where this ficticious \"electric potential\" is proportional to the external magnetic field. This allows one to solve for the scattering amplitudes using already known scalar QED results. Axion photon oscillations can be understood as violations of a charge symmetry in the scalar QED language. Going beyond the linear theory, the axion photon system in a self consistent magnetic field is shown, using this formalism, to have interesting soliton solutions that represent new non gravitational ways of trapping light. Finally, generalizing the scalar QED formalism to 2+1 dimensions makes it clear that a photon and an axion splitt into two components in an inhomogeneous magnetic field, an effect that reminds us of the Stern Gerlach experiment. From nano at bgu.ac.il Wed Mar 5 12:23:03 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-12 nanotechnology workshop Message-ID: <004d01c87eaa$e5a428a0$1b0e4884@estinano> Nanotechnology workshop, Wednesday March 12, 12:00 building 29, room 306,Chemistry Department seminar room Title : Photocatalysis with polymeric nanofibers containing both titanium dioxide and carbon nanotubes Speaker: Yaron Paz Department of Chemical Engineering, Technion Abstract: Composite poly(acrylonitrile) nanofibers containing both TiO2 nanoparticles and Multi Wall Carbon Nanotubes (MWCNT) were prepared by electrospinning. The self- photocatalytic degradation rates of the fibers as well as the photocatalytic degradation rates of two model contaminants: acetone and carbon tetrachloride were measured. A dramatic reduction in the UV- induced degradation rate of the nanofibers was observed in CNT-containing fibers. This stabilization phenomenon was corroborated by TEM micrographs of irradiated fibers showing little or no damage by TiO2 to fibers containing CNTs. Photodegradation kinetics measurements of both contaminants showed that this increased stabilization by the presence of CNTs did not have a negative effect on the ability of the composite fibers to photodegrade the contaminants. In fact, the photodegradation rate of CCl4 was higher by 33% in the presence of the CNTs, and that of acetone by 10%. Results are explained by a mechanism involving both charge transport of photoinduced charges from the titanium dioxide to the carbon nanotubes and an "adsorb & shuttle" effect. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080305/1e53eb8c/attachment.htm From physics at bgu.ac.il Sun Mar 9 14:37:36 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-12 Physical Chemistry Seminar Message-ID: <200803091237.OAA924496@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 12-03-2008 TIME: 4:00pm (Wed) PLACE: Chemistry club (Building #29, room 306) TITLE: \"Quantum stirring of condensed particles, and counting statistics in closed geometries\" SPEAKER: Prof. Doron Cohen, Department of Physics, BGU. ABSTRACT/COMMENTS: From physics at bgu.ac.il Tue Mar 11 11:16:14 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-17 Particles and Fields Seminar Message-ID: <200803110916.LAA1073139@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 17-03-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Continuous Axion Photon Duality, Axion Photon Oscillations, Solitons and Splitting SPEAKER: Prof. Eduardo Guendelman, BGU ABSTRACT/COMMENTS: The axion photon system in an external magnetic field, when for example considered with the geometry of the experiments exploring axion photon mixing (which can be represented by a 1+1 effective model) displays a continuous axion-photon duality symmetry in the limit the axion mass is neglected. The conservation law that follows from this symmetry is obtained. The magnetic field interaction is seen to be equivalent to first order to the interaction of a complex charged field with an external electric potential, where this ficticious \\\"electric potential\\\" is proportional to the external magnetic field. This allows one to solve for the scattering amplitudes using already known scalar QED results. Axion photon oscillations can be understood as violations of a charge symmetry in the scalar QED language. Going beyond the linear theory, the axion photon system in a self consistent magnetic field is shown, using this formalism, to have interesting soliton solutions that represent new non gravitational ways of trapping light. Finally, generalizing the scalar QED formalism to 2+1 dimensions makes it clear that a photon and an axion splitt into two components in an inhomogeneous magnetic field, an effect that reminds us of the Stern Gerlach experiment. From nano at bgu.ac.il Wed Mar 12 11:57:56 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-19 nanotechnology workshop Message-ID: <00b401c88427$8c64b3e0$1b0e4884@estinano> Nanotechnology workshop, Wednesday March 19, 12:00 building 29, room 306,Chemistry Department seminar room Title : New Horizons in Optical Nanocharacterization Speaker: Aaron Lewis Department of Applied Physics, The Selim and Rachel Benin School of Engineering and Computer Science, The Hebrew University of Jerusalem Abstract: Tools such as the atomic force microscope or the electron microscope have exceptional capabilities for nanocharacterization. Yet, there are many important problems that such tools fail to provide critical answers. A common characteristic of these problems is the need for optical information on the nanoscale. The goal of this lecture will be to give an insight into some of these problems and the nano optical methods that are yielding the critical information. As a result, such methods have become an important component in the arsenal of the nanotechnologist for addressing a variety of intractable problems ranging from nanochemical characterization to nanophotonic interactions. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080312/b0647938/attachment.htm From physics at bgu.ac.il Sun Mar 16 15:30:32 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-27 Nonlinear Dynamics Seminar Message-ID: <200803161330.PAA1479384@tzin.bgu.ac.il> Nonlinear Dynamics Seminar DATE: 27-03-2008 TIME: 10:30am (Thu) PLACE: Physics building (#54) room 207 TITLE: Self-Organized Quasiperiodicity in Oscillator Ensembles with Global Nonlinear Coupling SPEAKER: Prof. Michael Rosenblum, Departmen of Physics Potsdam University ABSTRACT/COMMENTS: We describe a transition from fully synchronous periodic oscillations to partially synchronous quasiperiodic dynamics in ensembles of identical oscillators with all-to-all coupling that nonlinearly depends on the generalized order parameters. We present an analytically solvable model that predicts a regime where the mean field does not entrain individual oscillators, but has a frequency incommensurate to theirs. The self-organized onset of quasiperiodicity is illustrated with Landau-Stuart oscillators and a Josephson junction array with a nonlinear coupling. From aaharony at bgu.ac.il Tue Mar 18 12:19:10 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-31 Condensed Matter Seminar Message-ID: <200803181019.MAA1635437@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 31-03-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Lapse of transmission phase and electron molecules in quantum dots SPEAKER: Prof. Shmuel Gurvitz , Weizmann Institute ABSTRACT/COMMENTS: The puzzling behavior of the transition phase in the resonant tunneling through a quantum dot can be understood in a natural way via a formation of the electron molecule in the quantum dot. In this case the resonance tunneling takes place through the quasi-stationary (doorway) state, which emerges when the number of electrons occupying the dot reaches a certain \"critical\" value. Our estimation of this quantity agrees with the experimental data. The dependence of the critical number on the dot\'s size is predicted as well. From nano at bgu.ac.il Wed Mar 19 13:37:40 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-26 nanotechnology workshop Message-ID: <009301c889b5$a39de8e0$1b0e4884@estinano> Nanotechnology workshop, Wednesday March 26, 12:00 building 29, room 306,Chemistry Department seminar room Title : Synthetic gene brushes Speaker: Roy Bar-Ziv Department of Materials and Interfaces Weizmann Institute of Science -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080319/0fdad12b/attachment.htm From idobd at bgu.ac.il Wed Mar 19 18:37:07 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-24 Particles and Fields Seminar Message-ID: <200803191637.SAA1733937@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 24-03-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: The generalized second law of thermodynamics and universal bounds SPEAKER: Itzhak Fouxon, HUJI ABSTRACT/COMMENTS: For quite a while already, the progress in fundamental physics produced no direct implications for everyday physics. However, it is expectable that the most fundamental level of reality, described by the yet to be found theory of quantum gravity, may have consequences for everyday quantities. The latter theory, which is to unify the quantum theory with the theory of gravity, may change our notions of spacetime dramatically and the demand that a theory is obtainable as an effective, low-energy description of quantum gravity may impose substantial limitations on quantities appearing in that theory. In this talk I will discuss the implications of a single macroscopic manifestation of the underlying quantum gravity known today - the generalized second law of thermodynamics. The law generalizes the usual second law to situations where black holes are present. The resulting entropy and viscosity bounds will be considered. From nano at bgu.ac.il Wed Mar 26 12:10:50 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-02 nanotechnology workshop Message-ID: <007601c88f29$ab1413f0$1b0e4884@estinano> Nanotechnology workshop, Wednesday April 2, 12:00 building 29, room 306,Chemistry Department seminar room Title : Manipulating Molecular Recognition with Electric Currents Speaker: Prof. Uri Sivan Technion Weizmann Institute of Science -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080326/ab809e6a/attachment.htm From nano at bgu.ac.il Wed Mar 26 12:17:13 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-02 nanotechnology workshop Message-ID: <000f01c88f2a$8f4f0ca0$1b0e4884@estinano> Nanotechnology workshop, Wednesday April 2, 12:00 building 29, room 306,Chemistry Department seminar room Title : Manipulating Molecular Recognition with Electric Currents Speaker: Prof. Uri Sivan Technion -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080326/43771780/attachment.htm From idobd at bgu.ac.il Thu Mar 27 13:46:48 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-03-31 Particles and Fields Seminar Message-ID: <200803271146.NAA2288048@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 31-03-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: The generalized second law of thermodynamics and universal bounds SPEAKER: Itzhak Fouxon, HUJI ABSTRACT/COMMENTS: For quite a while already, the progress in fundamental physics produced no direct implications for everyday physics. However, it is expectable that the most fundamental level of reality, described by the yet to be found theory of quantum gravity, may have consequences for everyday quantities. The latter theory, which is to unify the quantum theory with the theory of gravity, may change our notions of spacetime dramatically and the demand that a theory is obtainable as an effective, low-energy description of quantum gravity may impose substantial limitations on quantities appearing in that theory. In this talk I will discuss the implications of a single macroscopic manifestation of the underlying quantum gravity known today - the generalized second law of thermodynamics. The law generalizes the usual second law to situations where black holes are present. The resulting entropy and viscosity bounds will be considered. From aaharony at bgu.ac.il Mon Mar 31 12:58:06 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-07 Condensed Matter Seminar Message-ID: <200803310958.MAA2654054@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 07-04-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Electrostatics of Graphene Strips SPEAKER: Dr. Peter G. Silvestrov, Bochum, Germany ABSTRACT/COMMENTS: Distribution of charge induced by a gate voltage in a graphene strip is investigated. We calculate analytically the charge profile and demonstrate a strong(macroscopic) charge accumulation along the boundaries of a micrometers-wide strip. This charge inhomogeneity is especially important in the quantum Hall regime where we predict the doubling of the number of edge states and coexistence of two different types of such states. Applications to graphene-based nanoelectronics are discussed. From idobd at bgu.ac.il Tue Apr 1 23:26:28 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-07 Particles and Fields Seminar Message-ID: <200804012026.XAA2783405@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 07-04-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Confinement Effect as a Result from Spontaneous Breaking of Scale Invariance SPEAKER: Igor Korover, ABSTRACT/COMMENTS: In this talk the consequences of introducing spontaneous symmetry breaking of scale invariance through a scale that is obtained from the integration of the equations of motion of 4 index field strengths. Confinement is obtained for all values of this constant of integration. For negative values two point charges have a potential energy that grows linearly with distance, but they can be arbitrarily far apart (although this is expensive from the point of view of energy). For positive values of the integration constant, there is no possibility of separating charges too far, at a certain point a new charge of opposite sign has to be added to form a neutral system that cannot be bigger that a critical size. I will discuss this using different methods, including some developed by Adler and Piran and discuss a few alternative effective actions that are similar and that also give confinement. From physics at bgu.ac.il Wed Apr 2 08:42:21 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-07 Particles and Fields Seminar Message-ID: <200804020542.IAA2808635@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 07-04-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Confinement Effect as a Result from Spontaneous Breaking of Scale Invariance SPEAKER: Igor Korover, ABSTRACT/COMMENTS: In this talk the consequences of introducing spontaneous symmetry breaking of scale invariance through a scale that is obtained from the integration of the equations of motion of 4 index field strengths.Confinement is obtained for all values of this constant of integration. For negative values two point charges have a potential energy that grows linearly with distance, but they can be arbitrarily far apart (although this is expensive from the point of view of energy). For positive values of the integration constant, there is no possibility of separating charges too far, at a certain point a new charge of opposite sign has to be added to form a neutral system that cannot be bigger that a critical size. I will discuss this using different methods, including some developed by Adler and Piran and discuss a few alternative effective actions that are similar and that also give confinement. From nano at bgu.ac.il Wed Apr 2 09:59:09 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-02 nanotechnology workshop- CANCELLED Message-ID: <001001c8948f$0d12a8e0$1b0e4884@estinano> The seminar today is CANCELLED -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080402/1908eb7f/attachment.htm From nano at bgu.ac.il Wed Apr 2 11:06:16 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-09 nanotechnology workshop Message-ID: <008e01c89498$6d103e20$1b0e4884@estinano> Nanotechnology workshop, Wednesday April 9, 12:00 building 29, room 306,Chemistry Department seminar room Title: Bioelectronic Sensor for Medical Diagnostics; When Electronics Proteomics and Ionics Meet Speaker: Dr. Ilan Levy BioElectronic research project Intel Research Israel, Jerusalem Abstract: Biosensors are devices that can detect and/or quantify molecules of interest. Sensing occurs when an interaction between the sensing molecule and the analyte (biomarker) is detected. Biosensing research has grown rapidly over the past twenty years and, today, biosensors can detect practically any desired molecules. While hundreds of biosensors have been described in patents and in the scientific literature there is still very little use of such devices in practice. Since the development of the glucose sensor by Clark and Lyons in 1962, which is generally recognized as the first biosensor, many types of sensors have been developed in which a physical or chemical transducer is provided with a layer containing a biological sensing element. The combination of biologically active elements that have been developed during millions years of evolution, with optical or electronic transducer that detect physical signals creates hybrid nano-systems that bridge between the bio-world and the physical world. The objective of this research program is to develop electronic device for point of care (PoC) diagnostics as well as for laboratory testing. The device is based on a gate-less field effect transistor (FET) incorporating biological molecules as the capturing molecule. Advanced microfabrication technology found at Intel, provides robustness in sensor array formation thus delivering the potential for multiplexed diagnostics where multiple biomarkers will be detected simultaneously. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080402/a41aed1c/attachment.htm From physics at bgu.ac.il Thu Apr 3 11:04:38 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-09 Special Seminar Message-ID: <200804030804.LAA2904947@tzin.bgu.ac.il> Special Seminar DATE: 09-04-2008 TIME: 15:30pm(wed) PLACE: Auditorium 010 of the Life Science Building (38) TITLE: Bacteriophage Metagenomics SPEAKER: Prof. Peter Salamon, Department of Mathematics and Statistics San Diego State University ABSTRACT/COMMENTS: From idobd at bgu.ac.il Sun Apr 6 22:06:05 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-14 Particles and Fields Seminar Message-ID: <200804061906.WAA3179780@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 14-04-2008 TIME: 10:00am (Mon) PLACE: Physics building (#54) room 207 TITLE: Probing the quark-gluon-plasma via AdS/CFT SPEAKER: Amos Yarom, University of Munich ABSTRACT/COMMENTS: As a quark moves through a quark-gluon-plasma it looses energy, some of which may go into exciting hydrodynamic modes. Certain phenomenological models, used to explain correlations between hadronic jets in heavy ion collisions, require tuning the relative strength of these modes in order to fit the data. In this talk I show how one may use the gauge-string duality to study the channels of energy loss of a heavy parton moving through a strongly coupled conformal plasma. From physics at bgu.ac.il Mon Apr 7 14:22:54 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-09 Physical Chemistry Seminar Message-ID: <200804071122.OAA3215100@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 09-04-2008 TIME: 16:00pm(wed) PLACE: Bldg. 29, Room 306 (Seminar Room) TITLE: \"Efficient simulation of quantum evolution using dynamical coarse-graining\" SPEAKER: Michael Khasin, Department of Chemistry Hebrew University Jerusalem ABSTRACT/COMMENTS: The number of independent observables of a quantum system with the effective Hilbert space dimension N grows as N^2 which is a prohibitingly large number in physically interesting applications. Therefore, efficient simulation of a quantum dynamics must be oriented to simulating a small subset of observables. We propose a computational scheme using expansion of the evolving state in a certain observables-oriented time-dependent basis (the basis of the generalized coherent states (GCS) with respect to a distinguished subalgebra of observables). The propagation of the state and computation of the expectation values of the restricted set of observables can be performed efficiently, provided the number of terms in the expansion is not large. Unfortunately, a generic quantum dynamics leads to extensive branching of terms in the expansion of the evolving state. We argue that the corresponding dynamics of the restricted set of observables can still be simulated efficiently, provided a certain condition is met, which can be interpreted as a condition that the observables are \"classical\". The unitary evolution of \"classical\" observables can be simulated by an open system dynamics, resulting from the coupling of the system to a certain (fictitious) bath. This fictitious system-bath coupling should be viewed as a computational tool inducing a coarse graining of the evolving state. The resulting open system dynamics can be represented as the evolution of a mixture of quantum stochastic trajectories (unravelings), each representing an evolving superposition of a small number of the GCS. The quantum stochastic trajectories can be computed efficiently and the expectation values of the distinguished observables can be calculated efficiently for each trajectory. Averaging over the unravelings recovers the unitary evolution of the restricted set of observables. It is shown that the averaging can be performed efficiently provided the measurement of the corresponding observables in the lab can be performed efficiently. From nano at bgu.ac.il Wed Apr 9 12:01:58 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-16 nanotechnology workshop Message-ID: <004a01c89a20$5dfd2000$1b0e4884@estinano> Nanotechnology workshop, Wednesday April 16, 12:00 building 29, room 306,Chemistry Department seminar room Title: Linking morphology and performance in polymer photovoltaic solar-cells Speaker: Dr. Rafi Shikler Department of Electrical Engineering Ben Gurion University Abstract: Plastic electronic is a relatively new and rapidly growing field. Current products include devices such as polymer light emitting diodes, transistors, memories, smart cards and solar cells. Most of these products have comparable performance to solid-state devices. However, solar cells are still lagging far behind despite their economical potential. The study presented here is focused on understanding the role of polymer/polymer interfaces in organic solar cells and on new ways to improve their performance. I present a framework for the calculation of light absorption in multi-component polymer photocells. The model shows how carefully designed device structures can lead to a large enhancement in the light absorption by the device. I also present experimental results that show the effect of device morphology on its performance, in particular the effect of time evolution of composition next to polymer/polymer interface on device efficiency. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080409/3b833f73/attachment.htm From physics at bgu.ac.il Sun Apr 13 14:09:52 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-07 Astrophysics and Cosmology Seminar Message-ID: <200804131109.OAA3552721@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 07-05-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: \"The amplification of magnetic fields in parallel shocks\" SPEAKER: Dr. Brian Reville, Max Planck Institut f\\\"ur Kernphysik ABSTRACT/COMMENTS: The amplification of magnetic fields due to plasma instabilities in various energetic environments is a crucial issue for our understanding of particle acceleration and the observed emission from these regions. This process is supported both by observations of large magnetic fields close to the outer shocks of supernova remnants and also by the theoretical motivation to explain the origin of galactic cosmic rays. The so-called non-resonant current driven instability seems to be a likely mechanism capable of driving such strong amplification. The role of this instability in various environments is reviewed, and recent results from numerical simulations are presented. From physics at bgu.ac.il Sun Apr 13 14:52:02 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-16 Physical Chemistry Seminar Message-ID: <200804131152.OAA3708892@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 16-04-2008 TIME: 16:00pm(wed) PLACE: Bldg. 29, Room 306 (Seminar Room) TITLE: \"Quantum Measurements are Hot (or Cool)\" SPEAKER: Prof. Gershon Kurizki, Department of Chemical Physics,Weizmann Institute of Science ABSTRACT/COMMENTS: Prof. Kurizki will present new results on non-Markovian thermodynamics control. From physics at bgu.ac.il Sun Apr 27 10:35:34 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-04 Nonlinear Dynamics Seminar Message-ID: <200804270735.KAA4742471@tzin.bgu.ac.il> Nonlinear Dynamics Seminar DATE: 04-05-2008 TIME: 10:30am (Sun) PLACE: Physics building (#54) room 207 TITLE: The effects of chaotic mixing on fronts, patterns and synchronization of chemical reactions SPEAKER: Prof. Tom Solomon, Department of Physics & Astronomy Bucknell University, USA ABSTRACT/COMMENTS: We present experiments on advection-reaction-diffusion processes; specifically, pattern formation and front propagation in the Belousov-Zhabotinsky (BZ) reaction in a flow with chaotic advection. The flow is a chain of alternating vortices that oscillate and/or drift in the lateral direction. Mixing between the vortices is chaotic in this flow with either (enhanced) diffusive or superdiffusive transport. Experiments with the excitable BZ reaction are used to study the motion of reaction fronts in this system. If the vortices oscillate laterally, reaction fronts typically mode-lock to the external forcing. If the vortices drift with constant velocity, fronts typically pin to the leading vortex, remaining motionless in a reference frame that drifts with the vortices. Experiments with the oscillatory BZ reaction are used to study synchronization of a network of oscillators by chaotic mixing. We find that the system is globally-synchronized only if the long-range transport is superdiffusive, characterized by Levy flight trajectories. Time-permitting, we will also present results of experiments on chemical fronts and patterns in a two-dimensional array of vortices. From physics at bgu.ac.il Sun Apr 27 10:38:43 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-04 Special Nonlinear Dynamics Seminar Message-ID: <200804270738.KAA4741570@tzin.bgu.ac.il> Special Nonlinear Dynamics Seminar DATE: 04-05-2008 TIME: 10:30am (Sun) PLACE: Physics building (#54) room 207 TITLE: The effects of chaotic mixing on fronts, patterns and synchronization of chemical reactions SPEAKER: Prof. Tom Solomon, Department of Physics & Astronomy Bucknell University, USA ABSTRACT/COMMENTS: We present experiments on advection-reaction-diffusion processes; specifically, pattern formation and front propagation in the Belousov-Zhabotinsky (BZ) reaction in a flow with chaotic advection. The flow is a chain of alternating vortices that oscillate and/or drift in the lateral direction. Mixing between the vortices is chaotic in this flow with either (enhanced) diffusive or superdiffusive transport. Experiments with the excitable BZ reaction are used to study the motion of reaction fronts in this system. If the vortices oscillate laterally, reaction fronts typically mode-lock to the external forcing. If the vortices drift with constant velocity, fronts typically pin to the leading vortex, remaining motionless in a reference frame that drifts with the vortices. Experiments with the oscillatory BZ reaction are used to study synchronization of a network of oscillators by chaotic mixing. We find that the system is globally-synchronized only if the long-range transport is superdiffusive, characterized by Levy flight trajectories. Time-permitting, we will also present results of experiments on chemical fronts and patterns in a two-dimensional array of vortices. From physics at bgu.ac.il Sun Apr 27 13:57:14 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-01 Physics Colloquium Message-ID: <200804271057.NAA4753211@tzin.bgu.ac.il> Physics Colloquium DATE: 01-05-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Spins and Charges in Low dimensions SPEAKER: Prof. Amir Yacoby , Department of Physics,Harvard University Cambridge MA ABSTRACT/COMMENTS: The confinement of electrons to low dimension offers rich possibilities for exploring new physics in a controllable environment.In such restricted geometries, electronic excitations often acquire surprising physical properties that are a result of the underlying lattice and the Coulomb interaction among the electrons. In this talk we shall review some of our recent experiments that explore a variety of low dimensional systems of which some of their properties are listed below. Graphene for example is a two dimensional metal consisting of a monolayer of graphite, where the electronic excitations behave as mass-less relativistic particles. Subjecting a conventional but ultra clean two dimensional electron systems to a quantizing magnetic field opens up possibilities to explore novel phases where quasi particles obey non-Abelian statistics. When reducing dimensionality further to one dimension the electronic excitations loose completely their resemblance to regular electrons and properties such as spin and charge become decoupled and charge fractionalizes. From physics at bgu.ac.il Sun Apr 27 15:40:22 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-30 Physical Chemistry Seminar Message-ID: <200804271240.PAA4697292@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 30-04-2008 TIME: 16:00pm(wed) PLACE: Bldg. 29, Room 306 (Seminar Room) TITLE: \"All optical production of Li Bose Einstein condensate\" SPEAKER: Dr. Lev Khaykovich, Department of Physics Bar-Ilan University ABSTRACT/COMMENTS: We present an all-optical method of making Li Bose-Einstein condensates resonance. All-optical approach is particularly useful in case of Li atoms because the standard way of making BECs, i.e. evaporative cooling in a magnetic trap, is a challenging task due to several reasons that will be described in the talk. We discuss applications of Li BECs for precision measurements and research of localized states in the weakly interacting limit. From nano at bgu.ac.il Mon Apr 28 09:52:59 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-04-30 nanotechnology workshop Message-ID: <004e01c8a8fc$7f5c27b0$1b0e4884@estinano> Nanotechnology workshop, Wednesday April 30, 12:00 building 29, room 306,Chemistry Department seminar room Title: Synthesis, charectirazation and surface modification of magnetic and non-magnetic nanoparticles for medical imaging and cancer therapy Speaker: Shlomo.Margel Department of Chemistry Bar-Ilan University -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080428/709e96e3/attachment.htm From idobd at bgu.ac.il Thu May 1 12:07:33 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-05 Particles and Fields Seminar Message-ID: <200805010907.MAA5079682@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 05-05-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Classical effective field theory SPEAKER: Barak Kol, HUJI ABSTRACT/COMMENTS: The speaker will not give a seminar, but rather conduct a discussion about quantum and classical field theory. What qualitative phenomena in field theory are really quantum and which ones also appear in classical field theory. From physics at bgu.ac.il Mon May 5 15:13:50 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-11 Special Seminar Message-ID: <200805051213.PAA5384480@tzin.bgu.ac.il> Special Seminar DATE: 11-05-2008 TIME: 15:00pm(Sun) PLACE: Physics Build (#54), Seminar Room # 207 TITLE: \"MEAN FIELD APPROXIMATION FOR FINITE NUCLEI AND NUCLEAR MATTER\" SPEAKER: Prof. Shalom Shlomo, Cyclotron Institute Texas A&M University,College Station,USA ABSTRACT/COMMENTS: From ibar at bgu.ac.il Tue May 6 10:14:19 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-13 Lasers Seminar Message-ID: <20080506071456.9F709ABA3C@smtp1.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 13-05-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Improving Lasers Output Power and Beam Quality: Mode Selection and Passive Combining SPEAKER: Prof. Asher A. Friesem, Dept. of Physics of Complex Systems, Weizmann Institute of Science, Rehovot ABSTRACT/COMMENTS: New methods both for operating lasers with single high-order modes and for efficient passive combining of several laser distributions were developed. These methods are based on introducing intra-cavity phase elements, so as to obtain compact, stable, and practical laser configurations that can generate high output powers concomitantly with good output beam quality. The principles of the methods, the new laser configurations that include the phase elements, the experimental procedures and results with solid state and fiber lasers will be presented. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080506/d66d620f/attachment.htm From aaharony at bgu.ac.il Tue May 6 11:36:58 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-12 Condensed Matter Seminar Message-ID: <200805060836.LAA5388065@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 12-05-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Noise Anisotropy in YBa_2Cu_3O_(7-δ) Thin Films SPEAKER: Elad Zilber, Physics Dept., Ben Gurion University ABSTRACT/COMMENTS: The dependence of voltage noise on the direction of current flow with respect to c-axis of high-Tc YBa_2Cu_3O_{7-δ} (YBCO) thin films has been investigated. The experiments were performed using vicinal (103)/(013) oriented YBCO films with c-axis tilted 450 from the direction normal to the substrate edges enabled us to force current flow in various directions with respect to the c-axis. It has been determined that noise in the normal state is isotropic while the noise in the superconducting state depends on the direction of current flow. The difference steams from different origins of noise in both states. The noise in normal state is due to randomness in the motion of the charge carriers while in the superconducting state it arises from fluctuations of density and/or velocity of moving magnetic flux vortices. From physics at bgu.ac.il Sun May 11 08:58:01 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-15 Physics Colloquium Message-ID: <200805110558.IAA5743968@tzin.bgu.ac.il> Physics Colloquium DATE: 15-05-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Long-Range Order in Electronic Transport through Disordered Metal Film SPEAKER: Dr. Ron Folman , Department of Physics BGU. ABSTRACT/COMMENTS: Ultracold atom magnetic field microscopy enables the probing of current flow patterns in planar structures with unprecedented sensitivity. In polycrystalline metal (gold) films we observe long-range correlations forming organized patterns oriented at 45 degrees relative to the mean current flow, even at room temperature and at length scales orders of magnitude larger than the diffusion length or the grain size. The preference to form patterns at these angles is a direct consequence of universal scattering properties at defects. The observed amplitude of the current direction fluctuations scales inversely to that expected from the relative thickness variations, the grain size and the defect concentration, all determined independently by standard methods. This indicates that ultracold atom magnetometry enables new insight into the interplay between disorder and transport. [1] Science 319, 1226 (2008) [2] cond-mat 0803.4307 From aaharony at bgu.ac.il Mon May 12 10:05:56 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-19 Condensed Matter Seminar Message-ID: <200805120705.KAA5906799@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 19-05-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Dissipationless spin transport: an artifact of the theory or an observable phenomenon? SPEAKER: Prof. Edouard Sonin, Racah Institute of Physics, Hebrew University of Jerusalem ABSTRACT/COMMENTS: There is a long-standing interest to the problem of dissipationless spin transport in various media. In the past the focus was on magnetically ordered systems and superfluid 3He phases. Nowadays, spin transport is an essential part of spintronics. A system of special interest is the 2D electron gas with the Rashba spin-orbit interaction (Rashba medium), where they hope to realize effective methods to manipulate spins with an electric field. The possibility of spin transport with minimal losses is crucial for this. However, the concept of spin current itself was in the past and remains to be now a matter of controversy. The stumbling block for some theorists is the absence of the spin-conservation law, which requires introducing a source term (torque) in the continuity equation for spin. There were worries about ambiguity of spin-current definition, and as an extreme of this stance, claims that the spin current is not observable and has no physical meaning at all. The focus of the talk will be the analysis of the physical meaning of equilibrium spin currents in the Rashba medium and of the possibility to measure these currents mechanically. From nano at bgu.ac.il Mon May 12 10:28:21 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-14 nanotechnology workshop- NO SEMINAR Message-ID: <005101c8b401$c1af0960$1b0e4884@estinano> There is not a nano seminar this week Wednesday 14/05. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080512/018f45de/attachment.htm From ibar at bgu.ac.il Tue May 13 09:46:23 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-13 Lasers Seminar Message-ID: <20080513064710.35D24146C2A@smtp1.bgu.ac.il> Skipped content of type multipart/alternative-------------- next part -------------- _______________________________________________ Physics Department Homepage: http://www.bgu.ac.il/physics/ Campus map and directions: http://www.bgu.ac.il/physics/directions.html More information on [Phys-seminars]: http://www.bgu.ac.il/physics/phys_boards.html Subscription and unsubscription: http://lists.bgu.ac.il/mailman/listinfo/phys-seminars From physics at bgu.ac.il Tue May 13 10:44:28 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-19 Particles and Fields Seminar Message-ID: <200805130744.KAA5915004@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 19-05-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: \"A new geometrical embedding of nonrelativistic Hamiltonian mechanics and some speculations on a link between dark matter and dark energy\" SPEAKER: Prof. Larry Horwitz , Physics Departments Tel Aviv and Bar Ilan Universities ABSTRACT/COMMENTS: From physics at bgu.ac.il Tue May 13 10:46:18 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-19 Particles and Fields Seminar Message-ID: <200805130746.KAA5976690@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 19-05-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: \"A new geometrical embedding of nonrelativistic Hamiltonian mechanics and some speculations on a link between dark matter and dark energy\" SPEAKER: Prof. Larry Horwitz , Physics Departments Tel Aviv and Bar Ilan Universities ABSTRACT/COMMENTS: From physics at bgu.ac.il Tue May 13 10:58:46 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-19 Joint Particles Fields & Astrophysics Message-ID: <200805130758.KAA5977736@tzin.bgu.ac.il> Joint Particles Fields & Astrophysics DATE: 19-05-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: \"A new geometrical embedding of nonrelativistic Hamiltonian mechanics and some speculations on a link between dark matter and dark energy\" SPEAKER: Prof. Larry Horwitz , Physics Departments Tel Aviv and Bar Ilan Universities ABSTRACT/COMMENTS: From nano at bgu.ac.il Wed May 14 13:00:44 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-21 nanotechnology workshop Message-ID: <008501c8b5a9$60462790$1b0e4884@estinano> Nanotechnology workshop, Wednesday May 21, 12:00 building 29, room 306,Chemistry Department seminar room Title: Semiconductor Quantum Dots and DNA Nanostructures - New Perspectives for Nanotechnology and Nanobiotechnology Speaker: Professor Itamar Willner Institute of Chemistry The Hebrew University of Jerusalem -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080514/00fdb7b9/attachment.htm From physics at bgu.ac.il Thu May 15 12:27:53 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-21 Astrophysics and Cosmology Seminar Message-ID: <200805150927.MAA6100130@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 21-05-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: \"Comparisons between Effective-One-Body, analytic Gravitational Radiationwaveforms for binary black hole coalescence and numerical relativity data from simulations\" SPEAKER: Prof. Alessandro Nagar, Turin Polytechnic ABSTRACT/COMMENTS: I will discuss recent comparisons between Effective-One-Body (EOB), analytic gravitational waveforms for binary black hole coalescence and numerical relativity (NR) data from simulations of different groups: Caltech-Cornell (inspiral) data, AEI and Jena (coalescence data). The EOB waveform contains several \"flexibility parameters\" that need to be fixed. I will show how to jointly determine the values of these parameters by simultaneously best-fitting the EOB waveform to the NR waveforms. The resulting, ``best-fit\'\' EOB waveform is then shown to exhibit excellent agreement with NR coalescence data for several mass ratios. The dephasing between EOB and published Caltech-Cornell inspiral data is found to be smaller than $\\pm 2\\times 10^{-4} $gravitational wave cycles over the entire span ($3000M$, corresponding to 30 cycles) of the inspiral Caltech-Cornell simulation. The dephasings between EOB and coalescence data are found to be smaller than: (i) $\\pm 4\\times 10^{-3}$ gravitational wave cycles over $730M$ (11 cycles), in the equal mass case, and (ii) $\\pm 8\\times 10^{-3}$ gravitational wave cycles over about $900M$ (17 cycles) in the 2:1 mass-ratio case. These new results corroborate the aptitude of the EOB formalism to provide accurate representations of general relativistic waveforms, which are needed by currently operating gravitational wave detectors. From physics at bgu.ac.il Thu May 15 15:09:16 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-19 Special Colloquium Message-ID: <200805151209.PAA6161575@tzin.bgu.ac.il> Special Colloquium DATE: 19-05-2008 TIME: 3:00pm (Thu) PLACE: Physics building (#34) room 02 TITLE: \"Experimental Questions On The Nature of Mass And Dark Energy Including Can Dark Energy Be Detected In The Laboratory\" SPEAKER: Prof. Martin Perl, physics Nobel prize winner ABSTRACT/COMMENTS: From physics at bgu.ac.il Thu May 15 15:50:25 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-19 Special Physics Colloquium Message-ID: <200805151250.PAA6089997@tzin.bgu.ac.il> Special Physics Colloquium DATE: 19-05-2008 TIME: 15:00 ( Mon) PLACE: Physics building (#34) room 02 TITLE: \"Experimental Questions On The Nature of Mass And Dark Energy Including Can Dark Energy Be Detected In The Laboratory\" SPEAKER: Martin L. Perl (Nobel Prize), SLAC ABSTRACT/COMMENTS: From physics at bgu.ac.il Sun May 18 15:01:02 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-19 Special Physics Colloquium Message-ID: <200805181201.PAA6387341@tzin.bgu.ac.il> Special Physics Colloquium DATE: 19-05-2008 TIME: 15:00pm(Mon) PLACE: Building (#34) room 02 TITLE: \"Experimental Questions On The Nature of Mass And Dark Energy Including Can Dark Energy Be Detected In The Laboratory\" SPEAKER: Martin L. Perl (Nobel Prize), SLAC ABSTRACT/COMMENTS: From gideonc at bgu.ac.il Sun May 18 21:45:36 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-22 Physics Colloquium Message-ID: <200805181845.VAA6415545@tzin.bgu.ac.il> Physics Colloquium DATE: 22-05-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Spin filtering by nanospintronic devices SPEAKER: Prof. Amnon Aharony , Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq0708_B/Aharony.html Refreshments are served at 3:20pm From aaharony at bgu.ac.il Mon May 19 14:59:18 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-26 Condensed Matter Seminar Message-ID: <200805191159.OAA6471126@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 26-05-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Avalanches of BECs from leaking Optical Lattices SPEAKER: Prof. Tsampikos Kottos, Department of Physics, Wesleyan University, Middletown, USA ABSTRACT/COMMENTS: We investigate the outgoing atomic flux of BECs loaded in large optical lattices using a mean field Discrete Non-Linear Schroedinger Equation (DNLSE) approach. We show that for some critical values of the rescaled (with respect to the lattice size) interatomic interaction strength, the current decays in avalanches that follow a power-law distribution indicating the existence of a novel phase transition. The origin of this phenomenon is identified to be the collisions between stable and moving breathers which co-exist at the lattice. Using a reduce map we are able to provide bounds for the power law exponent of the avalanche distribution which reflect the complexity of the underlying classical phase-space. Due to the inter-disciplinary nature of the DNLSE, we expect that the same phenomenon will be observed in several other branches of nonlinear physics, ranging from nonlinear optics to polarons and biological molecules. From physics at bgu.ac.il Mon May 19 15:11:49 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-21 Physical Chemistry Seminar Message-ID: <200805191211.PAA6479859@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 21-05-2008 TIME: 16:00pm (Wed) PLACE: Chemistry club (Building #29, room 306) TITLE: \"Dogmatic and Pragmatic Spirits in Density Functional Theory\" SPEAKER: Prof. Roi Baer, Dept. of Chemistry The Hebrew University ABSTRACT/COMMENTS: We start with a brief introduction to density functional theory (DFT) including time-dependent DFT (TDDFT). The purpose is to focus on the problem of self-interaction plaguing the usual DFTs. We will discuss some areas in where this is most troublesome, such as molecular electronics and conductance, charge-transfer excited states, electronics and conductance, charge-transfer excited states, polarizability, near- field or electromagnetic coupling between weakly coupled systems. Finally a discussion of the long range correction will be given showing how it can help in solving some of the problems. We will also show some open issues and troubling aspects of the theory and discuss possible ways of overcoming them as well. From physics at bgu.ac.il Tue May 20 11:01:18 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-26 Particles and Fields Seminar Message-ID: <200805200801.LAA6538173@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 26-05-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Gauge Theory of The Second Type SPEAKER: Mr. Nadav Barkai, BGU University ABSTRACT/COMMENTS: This preliminary research exhibits a gauge theory model which deals with the construction and the basic relativistic dynamics of extended,closed, path dependent objects, usually referred as loops. We define metric function (distance) between any two loops that are embedded in a five dimensional M^4xS^1 space, with an extra compact dimension. The infinitesimal distance between two loops in loop space is determined by a norm of a ten dimensional vector, which is determined by the loop’s various cross sections on a different hyperplanes. This fact alone effectively maps the dynamics into ten dimensional space, dimensionality which is known to be important in a string theory, but arises naturally in our setup. We show that the extra compact dimensions crucial for the metric to be sensitive to the center of mass of the loop, which is crucial to obtain the point-like limit in which the distance between the two loops is dominated by the distance between their centers of masses in the usual sense. In this talk I will present the construction of the mathematical framework needed to establish the space of loops and its relation to the physical space-time. Also, I will present a simple toy model of loops on Minkowski space-time and discuss its loop space metric properties. From ibar at bgu.ac.il Tue May 20 15:17:59 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-27 Lasers Seminar Message-ID: <20080520121848.D95C3146C6E@smtp2.bgu.ac.il> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/x-ms-wmz Size: 370 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080520/16dbbe17/attachment.bin -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: image/gif Size: 189 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080520/16dbbe17/attachment.gif -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/octet-stream Size: 581 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080520/16dbbe17/attachment.obj From physics at bgu.ac.il Wed May 21 09:40:03 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-27 Lasers Seminar Message-ID: <200805210640.JAA6607390@tzin.bgu.ac.il> Lasers Seminar DATE: 27-05-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Improving the Chemical Oxygen-Iodine Laser (COIL) Efficiency by Corona/Glow Discharge SPEAKER: Mr. Zadok Dahan, Department of Physics BGU ABSTRACT/COMMENTS: The COIL (Chemical Oxygen Iodine Laser) is based on electronic transition between the spin-orbit levels of the ground electronic state of atomic iodine. This CW, supersonic gas flow laser, is characterized by large output power (up to tens kilowatts in some laboratories and few megawatts in the U.S. Air Force projects),a fairly short wavelength and a narrow emission line.The source of energy of the COIL are oxygen molecule in the metastable, excited singlet delta state, O2(1),which are produced in reaction of chlorine with hydrogen peroxide . I atoms are produced by dissociation of I2 in processes initiated by O2(1 molecules, which, in turn, excite the I atoms via resonant energy transfer.One of the problems that we have to overcome is the I atom quenching and recombination to I2 molecules.To minimize I and O2(1) losses, we pre-dissociated I2 by DC corona discharge in the transonic section of the secondary flow, right upstream of the chemical reaction region. As a result we got an enhancement of both the lasing power and the gain. From gideonc at bgu.ac.il Wed May 21 11:40:33 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-22 Colloquium reminder Message-ID: <200805210840.LAA6616183@tzin.bgu.ac.il> Colloquium reminder DATE: 22-05-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Spin filtering by nanospintronic devices SPEAKER: Prof. Amnon Aharony , Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq0708_B/Aharony.html Refreshments are served at 3:20pm From physics at bgu.ac.il Wed May 21 14:26:15 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-26 Physical Chemistry Seminar Message-ID: <200805211126.OAA6566289@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 26-05-2008 TIME: 16:00pm (Wed) PLACE: Chemistry club (Building #29, room 306) TITLE: \"Probing Complex Systems via Loschmidt Demons\" SPEAKER: Prof. Tsampikos Kottos, Department of Physics, Wesleyan University, Middletown CT, USA and MPI for Dynamics and Self-Organization, Goettingen, Germany ABSTRACT/COMMENTS: From gideonc at bgu.ac.il Fri May 23 12:54:25 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-29 Colloquium - no seminar this week Message-ID: <200805230954.MAA6780673@tzin.bgu.ac.il> Colloquium - no seminar this week DATE: 29-05-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Due to student day there is no Colloquium this week SPEAKER: , ABSTRACT/COMMENTS: From physics at bgu.ac.il Sun May 25 09:41:23 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-06-02 Particles and Fields Seminar Message-ID: <200805250641.JAA6314358@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 02-06-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: \"On Timelike Excitations in the Relativistic Harmonic Oscillator\" SPEAKER: Prof. Martin Land , Hadassa Academic College ABSTRACT/COMMENTS: From nano at bgu.ac.il Mon May 26 09:15:37 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:29 2009 Subject: [Phys-seminars] 2008-05-28 nanotechnology workshop Message-ID: <001401c8bef7$eac46c40$1b0e4884@estinano> Nanotechnology workshop, Wednesday May 28, 12:00 building 29, room 306,Chemistry Department seminar room Title: Nanoscience in the SPM lab at the Weizmann Institute of Science Speaker: Dr. Sidney Cohen Weizmann Institute of Science Abstract: Our laboratory is engaged in a number of projects ranging from determination of enzyme structure and activity, to nanomechanics, to electronic characterization at the nanoscale. This talk will present a scanning probe microscopy-based approach to nanoscience, with special concentration on two topics - probing structure and activity of an extracellular metallomatrix protein, and multiple approaches to determination of local elastic moduli with a point probe. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080526/8dc50acf/attachment.htm From nano at bgu.ac.il Mon May 26 12:38:54 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-02 nanotechnology- SPECIAL SEMINAR Message-ID: <012e01c8bf14$504a0ae0$1b0e4884@estinano> Nanotechnology SPECIAL SEMINAR, Monday June 2, 12:00 building 29, room 306,Chemistry Department seminar room Title: Nucleation in Polymeric and Complex Fluids Speaker: Prof. Zhen-Gang Wang Division of Chemistry and Chemical Engineering California Institute of Technology -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080526/c1937a2a/attachment.htm From physics at bgu.ac.il Mon May 26 13:03:29 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-02 Particles and Fields Seminar Message-ID: <200805261003.NAA7014368@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 02-06-2008 TIME: 10:00am (Mon) PLACE: Physics building (#54) room 207 TITLE: \"On Timelike Excitations in the Relativistic Harmonic Oscillator\" SPEAKER: Prof. Martin Land , Hadassa Academic College ABSTRACT/COMMENTS: From aaharony at bgu.ac.il Mon May 26 13:50:50 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-02 Condensed Matter Seminar Message-ID: <200805261050.NAA7016178@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 02-06-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Are Bosonic Replicas Faulty? SPEAKER: Professor Eugene Kanzieper, H.I.T. - Holon Institute of Technology ABSTRACT/COMMENTS: Motivated by the ongoing discussion about a seeming asymmetry in the performance of fermionic and bosonic replicas, we present an exact, nonperturbative approach to zero-dimensional replica field theories belonging to the broadly interpreted \"beta=2\" Dyson symmetry class. We then utilise the formalism developed to demonstrate that the bosonic replicas do correctly reproduce the microscopic spectral density in the QCD inspired chiral Gaussian unitary ensemble. This disproves the myth that the bosonic replica field theories are intrinsically faulty. From ibar at bgu.ac.il Wed May 28 09:58:24 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-03 Lasers Seminar Message-ID: <20080528065918.8AE88146C9F@smtp2.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 03-06-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Spectral signatures of biomolecules SPEAKER: Mr. Nitzan Mayorkas, Department of Physics, Ben Gurion University of the Negev ABSTRACT: The structure of biomolecules plays an important role in determining their selectivity and functionality. Molecular shapes and conformations of gas phase biomolecules are mostly investigated by coupling infrared (IR) excitation of fundamental vibrational modes with resonant two photon ionization (R2PI) in the ultraviolet (UV). However, due to the lack of tunable laser sources in the entire IR region, spectral features can be monitored only in a limited range. Therefore, we developed and employed, for the first time, a method combining Stimulated Raman Excitation (SRE) with ion dip spectroscopy (IDS) to investigate and map conformations of small biomolecules in the gas phase. The results show the great potential of the SRE-IDS technique, for obtaining the spectral signatures of biomolecules, while using available laser sources. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080528/5eda5131/attachment.htm From nano at bgu.ac.il Wed May 28 11:36:13 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-05-28 nanotechnology workshop- change of room Message-ID: <004501c8c09d$e39488e0$1b0e4884@estinano> The seminar will be today in building 59 -The Department of Chemical Engineering seminar room ----- Original Message ----- From: Nano To: nano Sent: Monday, May 26, 2008 9:15 AM Subject: 2008-05-28 nanotechnology workshop Nanotechnology workshop, Wednesday May 28, 12:00 building 29, room 306,Chemistry Department seminar room Title: Nanoscience in the SPM lab at the Weizmann Institute of Science Speaker: Dr. Sidney Cohen Weizmann Institute of Science Abstract: Our laboratory is engaged in a number of projects ranging from determination of enzyme structure and activity, to nanomechanics, to electronic characterization at the nanoscale. This talk will present a scanning probe microscopy-based approach to nanoscience, with special concentration on two topics - probing structure and activity of an extracellular metallomatrix protein, and multiple approaches to determination of local elastic moduli with a point probe. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080528/6a7aeb01/attachment.htm From nano at bgu.ac.il Wed May 28 11:36:56 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-05-28 nanotechnology workshop- change of room Message-ID: <005301c8c09d$fd4b5430$1b0e4884@estinano> The seminar will be today in building 59 -The Department of Chemical Engineering seminar room ----- Original Message ----- From: Nano To: nano Sent: Monday, May 26, 2008 9:15 AM Subject: 2008-05-28 nanotechnology workshop Nanotechnology workshop, Wednesday May 28, 12:00 building 29, room 306,Chemistry Department seminar room Title: Nanoscience in the SPM lab at the Weizmann Institute of Science Speaker: Dr. Sidney Cohen Weizmann Institute of Science Abstract: Our laboratory is engaged in a number of projects ranging from determination of enzyme structure and activity, to nanomechanics, to electronic characterization at the nanoscale. This talk will present a scanning probe microscopy-based approach to nanoscience, with special concentration on two topics - probing structure and activity of an extracellular metallomatrix protein, and multiple approaches to determination of local elastic moduli with a point probe. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080528/d17de3f1/attachment.htm From nano at bgu.ac.il Wed May 28 13:09:35 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-02 nanotechnology- SPECIAL SEMINAR-reminder Message-ID: <00bd01c8c0aa$ee938e00$1b0e4884@estinano> Nanotechnology SPECIAL SEMINAR, Monday June 2, 12:00 building 29, room 306,Chemistry Department seminar room Title: Nucleation in Polymeric and Complex Fluids Speaker: Prof. Zhen-Gang Wang Division of Chemistry and Chemical Engineering California Institute of Technology -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080528/a39e654c/attachment.htm From physics at bgu.ac.il Wed May 28 14:32:00 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-05-28 Physical Chemistry Seminar Message-ID: <200805281132.OAA7195420@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 28-05-2008 TIME: 4:00pm (Wed) PLACE: Chemistry club (Building #29, room 306) TITLE: \"Probing Complex Systems via Loschmidt Demons\" SPEAKER: Prof. Tsampikos Kottos, Department of Physics, Wesleyan University, Middletown CT, USA and MPI for Dynamics and Self-Organization, Goettingen, Germany ABSTRACT/COMMENTS: From gideonc at bgu.ac.il Thu May 29 20:50:27 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-05 Physics Colloquium Message-ID: <200805291750.UAA7290903@tzin.bgu.ac.il> Physics Colloquium DATE: 05-06-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: The beginning of the ends: a curvature-mediated mechanism for localization of lipids to bacterial poles SPEAKER: Dr. Kerwyn Casey Huang , Department of Molecular Biology, Princeton University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq0708_B/Huang.html Refreshments are served at 3:20pm From aaharony at bgu.ac.il Mon Jun 2 13:04:10 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-16 Condensed Matter Seminar Message-ID: <200806021004.NAA7571352@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 16-06-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Depth controlled beta-NMR and physics at interfaces SPEAKER: Dr. Zaher Salman, Rutherford Appleton Laboratory, Oxford University, UK ABSTRACT/COMMENTS: When two materials, A and B, are brought together the region near the interface has physical properties which are distinct from those of A and B. Few experimental methods are capable of examining local properties as a function of depth. Recently we have developed the technique of depth resolved beta-detected NMR for this purpose. In this talk I will review the principals of the technique and present of a few recent examples which include studies of superconductors near the surface, magnetic nano-structures and phase transitions near a surface. From aaharony at bgu.ac.il Mon Jun 2 20:19:20 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-23 Condensed Matter Seminar Message-ID: <200806021719.UAA7609914@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 23-06-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Molecular conduction and beyond SPEAKER: Professor Abraham Nitzan, School of Chemistry, tel Aviv University ABSTRACT/COMMENTS: In current/voltage conductance spectroscopy, the current I is measured through a structure as a function as the applied source-drain (sometimes also gate) voltage. Primarily, such conductance spectroscopy follows the current response to variations of voltage and provides insight into the junction electronic structure. This minimal description is supplemented by considering the interaction between the transmitting electrons and nuclear vibrations. Furthermore, with eye on issues of characterization, stability and control, other transport phenomena should be considered. This talk will address two such phenomena: Heating and heat conduction in molecular junctions and optical response of such systems. From gideonc at bgu.ac.il Tue Jun 3 12:06:35 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-05 Colloquium - reminder Message-ID: <200806030906.MAA7658839@tzin.bgu.ac.il> Colloquium - reminder DATE: 05-06-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: The beginning of the ends: a curvature-mediated mechanism for localization of lipids to bacterial poles SPEAKER: Dr. Kerwyn Casey Huang, Department of Molecular Biology, Princeton University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq0708_B/Huang.html Refreshments are served at 3:20pm From ibar at bgu.ac.il Tue Jun 3 17:31:16 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-10 Lasers Seminar Message-ID: <20080603143218.3B21E146EC5@smtp2.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 10-06-2008 TIME: 3:30 pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Rational Femtosecond Control of Multiphoton Excitations: from Weak-Field to Intermediate-Field Regime SPEAKER: Dr. Zohar Amitay, Schulich Faculty of Chemistry, Technion, Haifa, ABSTRACT/COMMENTS: Multiphoton absorption processes are among the processes over which femtosecond coherent control has been most effective. The present experimental and theoretical studies focus on rational pulse shaping based on identifying first the interference mechanism. The main model system is atomic sodium. First will be presented a weak-field example of a new (simple and very effective) scheme for extended multichannel selective control based on symmetry properties of the excitation channels. Our case involves two- and three-photon absorption channels. Then, results will be presented for two-photon absorption in the intermediate-field regime, where additionally to the weak-field (non-resonant) two-photon transitions also (resonance-mediated) four-photon transitions play a role. For understanding and designing the corresponding experiments, we have extended the powerful frequency -domain analysis beyond the lowest-order perturbation theory. This is a first step toward rational femtosecond control in a regime of considerable absorption yields. Along my talk, I will also present information processing aspects of our work. Time permitting, related to the three-photon control, results will also be shown for controlling the generation of coherent broadband UV radiation (i.e., a shaped UV femtosecond pulse) in a resonance-mediated three-photon NIR excitation. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080603/e496dbdf/attachment.htm From nano at bgu.ac.il Wed Jun 4 10:10:48 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-04 nanotechnology workshop-NO SEMINAR Message-ID: <007301c8c612$1d76b910$1b0e4884@estinano> No seminar today. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080604/ae87e0d8/attachment.htm From gideonc at bgu.ac.il Sun Jun 8 12:51:52 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-12 Physics Colloquium Message-ID: <200806080951.MAA7975633@tzin.bgu.ac.il> Physics Colloquium DATE: 12-06-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Interference patterns of directed waves SPEAKER: Prof. Oded Agam , Department of Physics, Hebrew University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq0708_B/Agam.html Refreshments are served at 3:20pm From physics at bgu.ac.il Tue Jun 10 14:20:55 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-18 Astrophysics and Cosmology Seminar Message-ID: <200806101120.OAA8179955@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 18-06-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: The Solar Corona Through Numerical Eyes SPEAKER: Dr. Ofer Cohen, Center for Space Environment Modeling University of Michigan ABSTRACT/COMMENTS: The solar lower atmosphere or the ‘Solar Corona’ is the region where the solar wind is accelerated and it defines the large-scale structure of the interplanetary space. The solar wind conditions affect Earth through the interaction between the Earth’s magnetic field and the interplanetary magnetic field under the collective terminology of ‘Space Weather’ phenomena. The theoretical description of the heating and accelerating of the solar wind is still incomplete. Therefore, any numerical model for the solar corona is required to include a heating and accelerating mechanism in order to obtain a solar wind solution. I will discuss the different theoretical models for driving the solar wind and present the solar wind acceleration mechanism used by the Michigan global MagnetoHydroDynamic model for the solar corona. I will also present validation of the model using long-term satellite data measured at the vicinity of the Earth. From nano at bgu.ac.il Wed Jun 11 09:18:49 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-11 nanotechnology workshop-NO SEMINAR Message-ID: <002b01c8cb8b$0376a920$1b0e4884@estinano> No seminar today. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080611/4e8bcb05/attachment.htm From ibar at bgu.ac.il Wed Jun 11 18:37:48 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-17 Lasers Seminar Message-ID: <20080611153853.1FE06146BE2@smtp2.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 17-06-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Usage of Photonics in Vision Science SPEAKER: Prof. Zeev Zalevsky, School of Engineering, Bar-Ilan University, Ramat-Gan ABSTRACT/COMMENTS: Digital imaging systems as well as human vision system have limited capability for separation of spatial features. Therefore, the imaging resolution is limited. The reasons to this limitation are related to the effect of diffraction i.e., the finite dimensions of the imaging optics, the geometry of the sensing array and its sensitivity as well as the axial position of the object itself which may be out of focus. In this talk we will present novel photonic approaches and means to exceed the above mentioned limitations existing in the vision science and eventually to allow us having super resolved imaging providing improved lateral and axial capabilities for separation of spatial features. We will also show how to use the photonic means in order to extract additional (not only visual) information of the surrounding scenery. In the presentation we will present techniques suitable for digital imaging systems as cameras, as well as all-optical techniques adequate for the human vision system. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080611/fa308a76/attachment.htm From silon at bgu.ac.il Fri Jun 13 11:11:31 2008 From: silon at bgu.ac.il (silon@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-16 Particles and Fields Seminar Message-ID: <200806130811.LAA8421557@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 16-06-2008 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: TBA SPEAKER: , Dr. Anatoly Dymarsky, Princeton University ABSTRACT/COMMENTS: TBA From gideonc at bgu.ac.il Sun Jun 15 09:51:12 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-19 Physics Colloquium Message-ID: <200806150651.JAA8500129@tzin.bgu.ac.il> Physics Colloquium DATE: 19-06-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Linear and nonlinear localization in optical lattices SPEAKER: Prof. Yaron Silberberg, Department of Physics, Weizmann Institute of Science. ABSTRACT/COMMENTS: Refreshments are served at 3:20pm From silon at bgu.ac.il Sun Jun 15 14:10:01 2008 From: silon at bgu.ac.il (silon@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-16 Particles and Fields Seminar Message-ID: <200806151110.OAA8584914@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 16-06-2008 TIME: 10:00am (Mon) PLACE: Physics building (#54) room 207 TITLE: D3-D7 on warped throat geometries SPEAKER: , Dr. Anatoly Dymarsky, Stanford University ABSTRACT/COMMENTS: I am going to discuss the dynamics of mobile branes on warped conical geometries and possible applications to the models of stringy inflation. From aaharony at bgu.ac.il Tue Jun 17 15:43:24 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-30 Condensed Matter Seminar Message-ID: <200806171243.PAA8744386@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 30-06-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: In memory of Pierre-Gilles de Gennes: his style and some of his major contributions to condensed matter physics. SPEAKER: Professor Yadin Y. Goldschmidt, Dept. of Physics and Astronomy, University of Pittsburg, Pittsburg PA, USA ABSTRACT/COMMENTS: In this talk I will review some of de Gennes important contributions to the theory of superconductivity, liquid crystals and polymers. I will discuss his unique style and give insights into his method of innovation. I will discuss his strong emphasis on connecting theory with experiments. From gideonc at bgu.ac.il Sun Jun 22 11:56:09 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-26 Physics Colloquium Message-ID: <200806220856.LAA9116259@tzin.bgu.ac.il> Physics Colloquium DATE: 26-06-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: The nuclear pore as a thermodynamic machine SPEAKER: Prof. Michael Elbaum , Department of Materials and Interfaces, Faculty of Chemistry, Weizmann Institute of Science ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq0708_B/Elbaum.html Refreshments are served at 3:20pm From dcohen at bgu.ac.il Mon Jun 23 13:00:06 2008 From: dcohen at bgu.ac.il (Cohen Doron) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-06-30 Condensed Matter Seminar - cancellation Message-ID: <485F7426.2030604@bgu.ac.il> Seminar canceled From aaharony at bgu.ac.il Tue Jun 24 14:12:45 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-07 Condensed Matter Seminar Message-ID: <200806241112.OAA9277623@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 07-07-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Quantum chaos on discrete graphs - periodic orbits, trace formula, $\\zeta$ functions and percolation SPEAKER: Professor Uzy Smilansky, Weizmann Institute, Rehovot, Israel ABSTRACT/COMMENTS: The Laplacian on discrete graphs offers the utmost simplification of the Schroedinger operator, and with the absence of any metric information, its complexity is derived only from its non trivial connectivity. Yet, many features which characterize Quantum Chaos on various manifolds such as billiards or metric graphs persist in the discrete version. I shall start by introducing an exact trace formula, a $\\zeta$ function and its combinatorial relatives. This will be followed by presenting the \"classical dynamics\" analogous to the quantum evolution. Finally, some spectral and wave functions statistics will be discussed, with special emphasize on nodal patterns, their morphology, counts and their relation to percolation models on graphs. From physics at bgu.ac.il Tue Jun 24 15:32:20 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-03 Physics Colloquium Message-ID: <200806241232.PAA9241406@tzin.bgu.ac.il> Physics Colloquium DATE: 03-07-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Spatial and temporal organization of telomeres in the nucleus & novel high resolution microscopy methods SPEAKER: Prof. Yuval Garini , Department of Physics Bar Ilan University ABSTRACT/COMMENTS: The human genome contains tenth of thousands of genes that are organized in chromosomes and packed in the nucleus of the cell in a non-random manner. We are studying the organization of the genome in normal and cancer cells by observing the telomeres and the telomeres dynamics. The distribution of the telomeres is found to be cell-cycle dependent and in tumor cells the telomeres form aggregates. We are currently studying the telomere fusion dynamics by following the telomeres in living cells. These studies require combining three-dimensional microscopy, image processing algorithms and novel physics methods. We also study the interaction of DNA and proteins by using tethered particle motion, a method that we are further developing, as well as other high resolution three dimensional microscopy methods. From silon at bgu.ac.il Thu Jun 26 12:52:25 2008 From: silon at bgu.ac.il (silon@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-02 Astrophysics and Cosmology Seminar Message-ID: <200806260952.MAA9433764@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 02-07-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: Spectral Signatures of Photon Axion Oscillations from Compact Astrophysical Sources SPEAKER: Doron Chelouche, CITA, Toronto, Canada ABSTRACT/COMMENTS: We give detailed predictions for the spectral signatures arising from photon particle oscillations in astrophysical objects. The calculations include quantum electrodynamics effects as well as those due to active relativistic plasma. We show that, by studying the spectra of compact sources, it may be possible to directly detect (pseudo) scalar particles, such as the axion, with much greater sensitivity, by roughly three orders of magnitude, than is currently achievable by other methods. In particular if such particles exists with masses < 0.01 ev and coupling constants to the electromagnetic field g > 1e(-13)/Gev, then their oscillation signatures are likely to be lurking in the spectra of magnestars, pulsars and quasars. From physics at bgu.ac.il Thu Jun 26 13:53:40 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-02 Joint Particle & Astrophysics Message-ID: <200806261053.NAA9352835@tzin.bgu.ac.il> Joint Particle & Astrophysics DATE: 02-07-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: Spectral Signatures of Photon Axion Oscillations from Compact Astrophysical Sources SPEAKER: Dr. Doron Chelouche, CITA, Toronto Canada ABSTRACT/COMMENTS: We give detailed predictions for the spectral signatures arising from photon particle oscillations in astrophysical objects. The calculations include quantum electrodynamics effects as well as those due to active relativistic plasma. We show that, by studying the spectra of compact sources, it may be possible to directly detect (pseudo) scalar particles, such as the axion, with much greater sensitivity, by roughly three orders of magnitude, than is currently achievable by other methods. In particular if such particles exists with masses < 0.01 ev and coupling constants to the electromagnetic field g > 1e(-13)/Gev, then their oscillation signatures are likely to be lurking in the spectra of magnestars, pulsars and quasars. From aaharony at bgu.ac.il Tue Jul 1 16:15:58 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-14 Condensed Matter Seminar Message-ID: <200807011315.QAA9705865@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 14-07-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Coupling a quantum dot to a non-Fermi-liquid lead: Universality and quantum phase transitions SPEAKER: Prpf. Richard Berkovits , Bar Ilan University, Ramat Gan ABSTRACT/COMMENTS: A quantum dot coupled to a one-dimensional lead in a non Fermi liquid phase (such as a Luttinger liquid, a commensurate or incommensurate charge density wave or a superconductor) is shown to exhibit an occupation which is universal, i.e., the same dot population dependence on the gate voltage for different parameters of the lead. Nevertheless, the tunneling density of states and conductance of the systems which show the same population will be quite different. Under certain conditions the population of the dot will show abrupt jumps corresponding to a quantum phase transition in the dot-lead system. From ibar at bgu.ac.il Wed Jul 2 08:44:41 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-08 Lasers Seminar Message-ID: <20080702054559.ADF6A146C82@smtp1.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 08-07-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Balanced Receiver for Coherent Detection SPEAKER: Mr. Shahar Hania, Elbit Systems - Elop Israel, ABSTRACT/COMMENTS: Vibration detection systems based on coherent detection use the reflected beam to be interfering with a local oscillator. This coherent detection method is widely used on telecom where the signal is phase modulated. On this work we will analyze the key characters and parameters of coherent detection and discuss advantages and disadvantages. In addition we shall analyze and demonstrate coherent detection scheme with a balanced receiver integrated and show the SNR improvement and its behavior with splitting ratio on the coupler. In addition we will discuss on range measurement option using frequency deferential with angle. At the end we will discuss also on an atmospheric communication application using a balanced receiver. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080702/82b60095/attachment.htm From ibar at bgu.ac.il Wed Jul 2 08:49:44 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-08 Lasers Seminar Message-ID: <20080702055103.1D20D146BCC@smtp1.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 08-07-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Balanced Receiver for Coherent Detection SPEAKER: Mr. Shahar Hania, Elbit Systems - Elop Israel ABSTRACT/COMMENTS: Vibration detection systems based on coherent detection use the reflected beam to be interfering with a local oscillator. This coherent detection method is widely used on telecom where the signal is phase modulated. On this work we will analyze the key characters and parameters of coherent detection and discuss advantages and disadvantages. In addition we shall analyze and demonstrate coherent detection scheme with a balanced receiver integrated and show the SNR improvement and its behavior with splitting ratio on the coupler. In addition we will discuss on range measurement option using frequency deferential with angle. At the end we will discuss also on an atmospheric communication application using a balanced receiver. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080702/11bd220f/attachment.htm From physics at bgu.ac.il Wed Jul 2 15:49:01 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-10 Physics Colloquium Message-ID: <200807021249.PAA9922739@tzin.bgu.ac.il> Physics Colloquium DATE: 10-07-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: First-principles calculations for the strong interactions? SPEAKER: Prof. Tom DeGrand , Department of Physics University of Colorado ABSTRACT/COMMENTS: Particle physicists would like to understand how bound states of quarks and gluons work, both for themselves and as a part of the general problem of testing the Standard Model. ``Lattice QCD\'\' is a mix of analytic and numerical techniques for studying these problems working directly from the Lagrangian. I will give an overview of the field: why we do what we do, a little bit about how we do it, and some stories about what we have learned (and what we have not learned) about the strong interactions. From physics at bgu.ac.il Thu Jul 3 13:03:44 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-09 Physical Chemistry Seminar Message-ID: <200807031003.NAA9973255@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 09-07-2008 TIME: 4:00pm (Wed) PLACE: Chemistry club (Building #29, room 306) TITLE: Atom chips and fundamental questions on decoherence SPEAKER: Prof. Carsten Henkel, Institut für Physik und Astronomie Universität Potsdam, Germany ABSTRACT/COMMENTS: Ultracold atoms that are tightly trapped near a microstructured surface form a system with remarkable properties. They are metastable with respect to molecule formation (three-body collisions) and to thermalization at the surface temperature, so that quantum dynamics and interference remain observable. For a quantum system in general, decoherence (the destruction of genuine superposition states) is thought to be a way towards classical behaviour as the system interacts with its environment. There are circumstances where this process is the fastest in relaxation towards thermal equilibrium, but counter-examples exist as well, like optical pumping and dark-state trapping, where relaxation leads to superposition or entangled states. The competition between a \"system Hamiltonian\" and the \"coupling to a bath\" can lead to different scenarios, and we outline a few examples to illustrate the difficulties of distinguishing between \"classical\" and \"quantum\" decoherence. We finally review fundamental and practical challenges to the study of decoherence with atom chips. From silon at bgu.ac.il Sat Jul 5 19:19:02 2008 From: silon at bgu.ac.il (silon@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-07 Particles and Fields Seminar Message-ID: <200807051619.TAA10139450@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 07-07-2008 TIME: 10:00am (Mon) PLACE: Physics building (#54) room 207 TITLE: The Universe as a Mathematical Structure SPEAKER: Marius Cohen, Department of Philosophy, Ben-Gurion University of the Negev ABSTRACT/COMMENTS: From physics at bgu.ac.il Sun Jul 6 09:05:33 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-09 Physical Chemistry Seminar Message-ID: <200807060605.JAA10123126@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 09-07-2008 TIME: 4:00pm (Wed) PLACE: Chemistry club (Building #29, room 306) TITLE: \"Atom chips and fundamental questions on decoherence\" SPEAKER: Prof. Carsten Henkel, Institut für Physik und Astronomie Universität Potsdam, Germany ABSTRACT/COMMENTS: Ultracold atoms that are tightly trapped near a microstructured surface form a system with remarkable properties. They are metastable with respect to molecule formation (three-body collisions) and to thermalization at the surface temperature, so that quantum dynamics and interference remain observable. For a quantum system in general, decoherence (the destruction of genuine superposition states) is thought to be a way towards classical behaviour as the system interacts with its environment. There are circumstances where this process is the fastest in relaxation towards thermal equilibrium, but counterexamples exist as well, like optical pumping and dark-state trapping, where relaxation leads to superposition or entangled states. The competition between a \"system Hamiltonian\" and the \"coupling to a bath\" can lead to different scenarios, and we outline a few examples to illustrate the difficulties of distinguishing between \"classical\" and \"quantum\" decoherence. We fi nally review fundamental and practical challenges to the study of decoherence with atom chips. From physics at bgu.ac.il Mon Jul 7 10:12:40 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-22 Colloquium - Blaustein Institute Message-ID: <200807070712.KAA10271377@tzin.bgu.ac.il> Colloquium - Blaustein Institute DATE: 22-07-2008 TIME: 10:30am (Tue) PLACE: Seminar Room Sede Boqer TITLE: Green and Red Uses of Solar Energy SPEAKER: Prof. David Faiman, Department of Solar Energy and Environmental Physics Institute for Dryland Environmental Research Ben-Gurion University ABSTRACT/COMMENTS: The colloquium will discuss a number of widely held misconceptions regarding the extent to which supposedly \"green\" actions, both at the individual and governmental levels can lead to a cleaner environment. A few examples are: government subsidies for PV systems; the potential contribution of roof-top or buildingintegrated PV systems; the use of low-power light bulbs; and several others. After attacking many of our \"sacred cows\" some concrete suggestions will be presented for actions that could significantly improve the environment. From silon at bgu.ac.il Mon Jul 7 15:32:36 2008 From: silon at bgu.ac.il (silon@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-09 Particles and Fields Seminar Message-ID: <200807071232.PAA10309735@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 09-07-2008 TIME: 12:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Moduli Fixing in Quasi-realistic heterotic String Models SPEAKER: Alon Faraggi, University of Liverpool ABSTRACT/COMMENTS: From silon at bgu.ac.il Mon Jul 7 15:40:30 2008 From: silon at bgu.ac.il (silon@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-09 Particles and Fields Seminar Message-ID: <200807071240.PAA10205296@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 09-07-2008 TIME: 12:00am (Wed) PLACE: Physics building (#54) room 207 TITLE: Moduli Fixing in Quasi-realistic Heterotic String Models SPEAKER: Alon Faraggi, University of Liverpool ABSTRACT/COMMENTS: From aaharony at bgu.ac.il Tue Jul 8 14:21:28 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-21 Condensed Matter Seminar Message-ID: <200807081121.OAA10299177@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 21-07-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Expansion of cold atomic gases in the presence of disorder SPEAKER: Profesor Boris Shapiro, Technion ABSTRACT/COMMENTS: I will discuss the expansion of a Bose-Einstein condensate, released from a harmonic trap, in the presence of a random potential. The potential causes scattering of the condensate and prevents its free propagation. Under appropriate conditions, some part of the condensate will \"get stuck\" (Anderson localization), whereas the other part will diffuse away. Expansion of a cold Fermi gas will also be discussed. From ibar at bgu.ac.il Wed Jul 9 08:28:41 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-15 Lasers Seminar Message-ID: <20080709053018.91B37E31DF@smtp2.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 15-07-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Detection of explosives from a distance with femtosecond shaped pulses SPEAKER: Mr. Adi Natan, Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot ABSTRACT/COMMENTS: Standoff spectroscopy and detection schemes span almost every instrumental method available, including diverse optical spectroscopy methods. Usually there is an inherent tradeoff between sensitivity, selectivity and speed; while some methods are very sensitive, acquisition time is quite slow. On the other hand, faster standoff techniques apply intense pulses that may deteriorate the substance, which is critical in certain applications. We present a single-pulse scheme that may overcome the inherent limitations of other current standoff schemes. This is obtained by multiplex coherent anti-Stokes Raman scattering spectroscopy (CARS) using a single femtosecond phase-shaped or amplitude-shaped laser pulse. We harness the strong non-resonant background for amplification of the backscattered resonant CARS signals by employing homodyne detection. We demonstrate standoff (>10 meters) detection and identification of various materials including minute amounts of explosives under ambient light conditions. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080709/83297206/attachment.htm From gideonc at bgu.ac.il Sun Jul 13 14:33:27 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-17 Physics Colloquium Message-ID: <200807131133.OAA10594006@tzin.bgu.ac.il> Physics Colloquium DATE: 17-07-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: DNA as exemplary polymer SPEAKER: Prof. Oleg Krichevsky, Department of Physics, Ben-Gurion University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq0708_B/Oleg.html Refreshments are served at 3:20pm From physics at bgu.ac.il Sun Jul 13 15:26:20 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-23 Astrophysics and Cosmology Seminar Message-ID: <200807131226.PAA10792889@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 23-07-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: Type III - L Solar Radio Bursts and their Correlations With Solar Energetic Proton Events SPEAKER: Mr. Robert Duffin, george Mason University ABSTRACT/COMMENTS: From silon at bgu.ac.il Tue Jul 15 17:32:12 2008 From: silon at bgu.ac.il (silon@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-21 Particles and Fields Seminar Message-ID: <200807151432.RAA10873727@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 21-07-2008 TIME: 10:00am (Mon) PLACE: Physics building (#54) room 207 TITLE: Black Hole Entropy, Quantum Corrections and does Nature abhor Logarithms? SPEAKER: Joey Medved, niversity of Seoul ABSTRACT/COMMENTS: From ibar at bgu.ac.il Tue Jul 15 17:43:51 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-22 Lasers Seminar Message-ID: <20080715144534.C94C0AB885@smtp2.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 22-07-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Slow-Light Rotation Sensor - Breaking the Century-Old Sagnac Limit SPEAKER: Dr. Jacob (Koby) Scheuer, Department of Physical Electronics, Tel-Aviv University ABSTRACT/COMMENTS: Precise positioning and motion tracking appear to be enabling and key capabilities, highly desired in numerous technologies and applications. Global positioning system receivers, for example, are becoming standard components not only in special-purpose navigation systems, but also in mobile phones, laptops and even pet collars. However, applications in control, stabilization and positioning systems for robotics, medical imaging, virtual reality etc. require not only the three axes for objects position, but their complete stare in space (including spin, pitch and yaw). Such six degrees of freedom positioning systems necessitate highly accurate and ultra-compact rotation rate sensors (Gyroscopes). While rotation sensing can be based on both mechanical and optical effects, it is the optical Gyros which provide both higher sensitivity and lower drift rates. Optical rotation sensors exploit the Sagnac effect - the different phase shifts accumulated by waves propagating in a circular path along or against the rotation direction. The classical Sagnac phase shift is determined solely by the angular velocity, the optical frequency and the area circumvented by the closed-loop optical path while completely independent of the other properties of the medium such as the index of refraction and dispersion properties. This century-old result has been the subject of ongoing debates for several decades not only because to its fundamentality but also because it inherently limits the possibilities to attain highly-sensitive miniaturized rotation sensors. Recent studies of the Sagnac effect in coupled cavities slow-light structures (SLS) indicated their potential for responsivity enhancement while retaining compact dimensions. In particular, it was found that the responsivity of SLS based Gyros is determined not only by the area of the device. Other parameters such as number of cavities, inter-cavity coupling and the area of the individual cavities play a role in determining the Gyro responsivity, thus enabling the realization of compact while sensitive optical rotation sensor. In the talk, I will present the physical mechanisms of both passive and active (laser) SWS-based Gyros and discuss their advantages and limitations. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080715/79502bbe/attachment.htm From physics at bgu.ac.il Wed Jul 16 15:23:16 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-24 Physics Colloquium Message-ID: <200807161223.PAA10964892@tzin.bgu.ac.il> Physics Colloquium DATE: 24-07-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Green and red uses of solar energy SPEAKER: Prof. David Faiman , Department of Solar Energy and Environmental Physics, The Jacob Blaustein Institute for Desert Research and Department of Physics,BGU. ABSTRACT/COMMENTS: The colloquium will discuss a number of widely held misconceptions regarding the extent to which supposedly \"green\" actions, both at the individual and governmental levels can lead to a cleaner environment. A few examples are:government subsidies for PV systems; the potential contribution of roof-top or building-integrated PV systems; the use of low-power light bulbs; and several others. After attacking many of our \"sacred cows\" some concrete suggestions will be presented for actions that could significantly improve the environment. From aaharony at bgu.ac.il Mon Jul 21 10:47:52 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-08-04 Condensed Matter Seminar Message-ID: <200807210747.KAA10622610@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 04-08-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Single Spin detection with the scanning tunneling microscope SPEAKER: Professor Yshay Manassen, Physics Department, Ben Gurion University ABSTRACT/COMMENTS: We are using the noise level in the tunneling current at the Larmor frequency of a single electron spin to detect it with the STM. Several spins center were detected. Pb centers, iron atoms and paramagnetic molecules adsorbed on the surface. The frequency of these noise spectra was found to fluctuate. We demonstrate that when the spectra of hundreds of spins are observed, the histogram of their frequency is similar to the linewidth of macroscopic ESR of the same spin centers. We demonstrate that by changing the tunneling conditions, the histograms are changing as well. The instrumental aspect of this method will be discussed, together with the possible mechanism, and future potential – in particular with a new low temperature microscope – will be described. From AAHARONY at bgu.ac.il Mon Jul 21 10:49:14 2008 From: AAHARONY at bgu.ac.il (AAHARONY@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-28 Condensed Matter Seminar Message-ID: <200807210749.KAA11291177@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 28-07-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: NO SEMINAR THIS WEEK SPEAKER: , ABSTRACT/COMMENTS: From silon at bgu.ac.il Wed Jul 23 14:02:37 2008 From: silon at bgu.ac.il (silon@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-28 Particles and Fields Seminar Message-ID: <200807231102.OAA68975@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 28-07-2008 TIME: 10:00am (Mon) PLACE: Physics building (#54) room 207 TITLE: Lightlike Braneworlds SPEAKER: Emil Nissimov, Bulgarian Academy of Sciences, Sofya, Bulgaria ABSTRACT/COMMENTS: From ibar at bgu.ac.il Wed Jul 23 16:43:24 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-07-29 Lasers Seminar Message-ID: <20080723134511.6FD30146DDB@smtp1.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 29-07-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Intramolecular dynamics on the ground and first excited electronic states of methylamine SPEAKER: Mr. Ran Marom, Physics Department, Ben Gurion University of the Negev ABSTRACT/COMMENTS: The simplest primary amine, methylamine (CH3NH2), has been in the focus of extensive studies for unraveling its spectroscopy and photophysics. In this talk I will present our latest results regarding the effect of tunneling on the dissociation of H atoms and the vibrational energy flow following initial vibrational excitation. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080723/0a3af31a/attachment.htm From silon at bgu.ac.il Sun Jul 27 18:34:06 2008 From: silon at bgu.ac.il (silon@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-08-04 Particles and Fields Seminar Message-ID: <200807271534.SAA391044@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 04-08-2008 TIME: 10:00am (Mon) PLACE: Physics building (#54) room 207 TITLE: Lightlike Branes and Mass Inflation SPEAKER: Svetlana Pacheva, Bulgarian Academy of Sciences, Sofia , Bulgaria ABSTRACT/COMMENTS: From ibar at bgu.ac.il Fri Aug 1 18:46:01 2008 From: ibar at bgu.ac.il (Ilana Bar) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-08-05 Lasers Seminar Message-ID: ANNOUNCEMENT==> Lasers Seminar DATE: 05-08-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Tunneling, Conical Intersections and Molecular Dynamics SPEAKER: Mr. Chen Levi, Department of Physics, Ben Gurion University of the Negev ABSTRACT/COMMENTS: The potential energy surfaces of the ground and first electronic states of methylamine, CH3NH2, were calculated using the multi-reference configuration interaction method. The characteristics of the first electronic state surface, including a finite potential energy barrier and a line of conical intersections with the ground electronic state will be discussed, while highlighting their implications on the dynamics during N-H bond fission. Prof. I. Bar Department of Physics Ben-Gurion University of the Negev Beer Sheva 84105 ISRAEL? -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080801/77245943/attachment.htm From physics at bgu.ac.il Mon Aug 11 09:07:50 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-08-18 Special Seminar Message-ID: <200808110607.JAA1538591@tzin.bgu.ac.il> Special Seminar DATE: 18-08-2008 TIME: 15:00pm (mon) PLACE: Physics building (#54) room 207 TITLE: RF Paul traps for quantum information experiments with laser-cooled ions SPEAKER: Dr. Roee Ozeri , Weizmann ABSTRACT/COMMENTS: During the last few years, all the requirements form a quantum register have been experimentally demonstrated with ions that are trapped in linear RF Paul traps. The current effort is in the scaling of this system to a large number of trapped ions. This scaling requires the use of a multiplexed array of micro-traps. In this talk I will discuss the current status and challenges for using micro RF Paul traps for the purpose of quantum information processing with trapped ions, both in terms of fabrication and in terms of the consequences on the trapped ion coherence. From physics at bgu.ac.il Sun Aug 17 15:21:28 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-09-03 Special Physics Colloquium Message-ID: <200808171221.PAA62269@tzin.bgu.ac.il> Special Physics Colloquium DATE: 03-09-2008 TIME: 11:00am (Wed) PLACE: Physics building (#54) room 207 TITLE: Quasi-Phase-Matching Methods in Perturbative and Extreme Nonlinear Optics SPEAKER: Dr. Alon Bahabad, JILA,University of Colorado USA ABSTRACT/COMMENTS: Efficient harmonic generation by a nonlinear optical process is hindered by dispersion – causing the fundamental and harmonic beams to be out of phase. Quasi phase matching (QPM) solves this problem by sequentially resetting the accumulated phase mismatch between the fundamental and harmonic beams. This is usually accomplished by a periodic modulation of the nonlinear susceptibility of the medium.This applies to both perturbative low-order harmonics (2nd 3rd, etc.) and to extreme nonlinear optics in which high order harmonics (~100) are generated. Several extensions of the basic QPM technique relevant to both regimes are discussed. From physics at bgu.ac.il Mon Sep 1 14:06:12 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-09-03 Colloquium reminder Message-ID: <200809011106.OAA1279937@tzin.bgu.ac.il> Colloquium reminder DATE: 03-09-2008 TIME: 11:00am (Wed) PLACE: Physics building (#54) room 207 TITLE: Quasi-Phase-Matching Methods in Perturbative and Extreme Nonlinear Optics SPEAKER: Dr. Alon Bahabad, JILA,University of Colorado USA ABSTRACT/COMMENTS: Efficient harmonic generation by a nonlinear optical process is hindered by dispersion – causing the fundamental and harmonic beams to be out of phase. Quasi phase matching (QPM) solves this problem by sequentially resetting the accumulated phase mismatch between the fundamental and harmonic beams. This is usually accomplished by a periodic modulation of the nonlinear susceptibility of the medium.This applies to both perturbative low-order harmonics (2nd 3rd, etc.) and to extreme nonlinear optics in which high order harmonics (~100) are generated. Several extensions of the basic QPM technique relevant to both regimes are discussed. From ibar at bgu.ac.il Wed Sep 24 08:13:39 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-10-06 Lasers Seminar Message-ID: <20080924051616.B3416146C85@smtp1.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 06-10-2008 TIME: 3:30pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Optical absorption in slow cooled LiF:Mg,Ti material SPEAKER: Mr. Stanislav Zlatopolsky, Department of Physics, Ben Gurion University of the Negev ABSTRACT/COMMENTS: The competitive, luminescence and electrons trapping centers are playing essential role in thermo luminescence mechanism. The useful method to characterize these centers is measurement of Optical Absorption of the material. Radiation damage of center, influence of material cooling rate on optical absorption and optical density as function of dose will be discussed, while highlighting their implications on the characterization of competitive, luminescence and electrons trapping centers. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20080924/4dbcd9ee/attachment.htm From gideonc at bgu.ac.il Sun Oct 26 17:57:25 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-10-30 Special Colloquium Message-ID: <200810261557.RAA284250@tzin.bgu.ac.il> Special Colloquium DATE: 30-10-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: MechanoBiology of Genome Assembly & Regulation SPEAKER: Dr. G. V. Shivashankar, National Center for Biological Sciences Tata Institute of Fundamental Research, Bangalore, India ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq09_A/Shiva.html Refreshments are served at 3:20pm From physics at bgu.ac.il Mon Oct 27 15:53:02 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-18 Special Physical Chemistry Seminar Message-ID: <200810271353.PAA354184@tzin.bgu.ac.il> Special Physical Chemistry Seminar DATE: 18-11-2008 TIME: 15:30pm(Tue) PLACE: bldg.54, room 207 (physics Dep Seminar room) TITLE: \"Optical magnetometers: advances and applications (including nuclear magnetic resonance)\" SPEAKER: Prof. Dmitry Budker, Department of Physics, University of California at Berkeley and Nuclear Science Division LBNL ABSTRACT/COMMENTS: I will describe the physics of and recent advances in optical magnetometers. One recent area of application of these devices is signal detection in nuclear magnetic resonance (NMR) and magnetic-resonance imaging (MRI). As an example, I will describe our recent work on the zero-field measurements of the scalar (\"J\") couplings between hetero- and homonuclear spins in various molecules. From physics at bgu.ac.il Mon Oct 27 16:01:51 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-03 Special Seminar Message-ID: <200810271401.QAA354087@tzin.bgu.ac.il> Special Seminar DATE: 03-11-2008 TIME: 15:30pm (Mon) PLACE: Physics building (#54) Room (217) TITLE: The marriage of infrared spectroscopy to medicine SPEAKER: Prof. Henry Mantsch, Senior Science Advisor Department of Foreign Affairs Canada ABSTRACT/COMMENTS: It is no secret that throughout history infrared spectroscopy and medicine have evolved quite separately, like two solitudes. On the other hand, optical spectroscopy has long been used as a tool in diagnostic disease management, whereas infrared spectroscopy is a much more recent addition to the toolbox of medicine. The use of the various regions of the electromagnetic spectrum has made major inroads into diagnostic medicine as demonstrated by the explosion of functional MRI. Biomedical applications of infrared spectroscopy are only slowly following suit. The applications generally fall into two categories: (1) Ex vivo, that is the quantitative analysis of excised or extracted tissues or bio-fluids, and (2) In-vivo, the in-situ analysis of accessible body parts, providing a window into human metabolism. The major impact areas of biomedical IR spectroscopy are (i) clinical chemistry, (ii) pathology and (iii) radiology or in-vivo imaging. From physics at bgu.ac.il Mon Oct 27 16:10:01 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-05 Special Seminar Message-ID: <200810271410.QAA358080@tzin.bgu.ac.il> Special Seminar DATE: 05-11-2008 TIME: 15:30pm (Wed) PLACE: Physics building (#54) room (217) TITLE: A history of biomedical spectroscopy SPEAKER: Prof. Henry Mantsch, Senior Science Advisor Department of Foreign Affairs Canada ABSTRACT/COMMENTS: How far should we go back, what are biomolecules ? Well, it all started with the big bang some 20 billion years ago. Biological molecules are the product of a long biological evolution, whereby these specialized molecules were selected for their fitness to perform specific functions. While individual biomolecules conform to all the physical laws of inanimate matter, a collection of such biomolecules has properties not shown by inanimate matter. It is therefore not surprising that curious spectroscopists have turned their attention to the study of biomolecules. Already in the1940s and 1950s there were some “Jules Verne” type visionaries who studied biomedical specimens, however this research only took off in the late 1980s and 1990s, driven primarily by novel developments in instrumentation and in computational data analyses. There was an interesting cross-fertilization from the more recent NMR to the older IR as FT-NMR was developed before FT-IR. From physics at bgu.ac.il Mon Oct 27 16:17:51 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-06 Special Physics Colloquium Message-ID: <200810271417.QAA358358@tzin.bgu.ac.il> Special Physics Colloquium DATE: 06-11-2008 TIME: 15:30pm (Thu) PLACE: Physics building (#54) room (217) TITLE: Today’s mobility of scientists and the social and economic consequences SPEAKER: Prof. Henry Mantsch, Senior Science Advisor Department of Foreign Affairs Canada ABSTRACT/COMMENTS: There is no doubt that the advancing globalization of science breaks down all national borders. Yet, no single country, large or small, old or young, has the monopoly on innovation or on new ideas. The mobility of scientists, which is a direct consequence of the globalization of science, requires that we replace the old paradigms of “Brain Drain” and “Brain Gain” with that of “Brain Circulation”. In the new, knowledge-based society, it is the international pool of scientists that provides the basis for our national and international well-being. Furthermore, the circulation of individuals from continent to continent, from culture to culture, inevitably has also social consequences. From physics at bgu.ac.il Mon Oct 27 16:22:23 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-10 Special Colloquium Message-ID: <200810271422.QAA356175@tzin.bgu.ac.il> Special Colloquium DATE: 10-11-2008 TIME: 15:30pm (Mon) PLACE: Physics building (#54) room (217) TITLE: International cooperation in science: A Canadian perspective SPEAKER: Prof. Henry Mantsch, Senior Science Advisor Department of Foreign Affairs Canada ABSTRACT/COMMENTS: In the age of globalization, international cooperation is an imperative. Isolation and protectionism ruin initiatives and competition, leading only to stagnation. Yet, today the international scientific community faces a dichotomy: the creation of new knowledge is an international effort, done by individuals, the Nobel Prize being the ultimate recognition. On the other hand, the translation of the created intellectual goods into material goods and the generation of consumer products occur primarily at the national level. This means that international cooperation in science at one end and competition in the global marketplace at the other end represents a delicate balancing act. A review of the Canadian science and technology landscape illustrates this dichotomy. From physics at bgu.ac.il Mon Nov 3 15:09:47 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-05 Nanotechnology Workshop Message-ID: <200811031309.PAA917197@tzin.bgu.ac.il> Nanotechnology Workshop DATE: 05-11-2008 TIME: 12:00 (noon) PLACE: Chemistry club (Building #29, room 306) TITLE: Self-organization of Min proteins in vitro SPEAKER: Prof. Karsten Kruse, Theoretische Physik Universität des Saarlandes ABSTRACT/COMMENTS: In the bacterium Eschrichia coli, the Min proteins oscillate between the two cell poles. At the poles they prevent cell division which occurs thus in the cell center. According to several theoretical studies, these Min oscillations could result from self--organization of the two proteins MinD and MinE inthe presence of a membrane and ATP. We tested these predictions in anin vitro assay of a supported lipid bilayer together with purified MinD and MinE as well as ATP. We find the proteins to organize into planar or spiral surface waves. We show that the in vitro as well as the in vivo structures can be generated by the same mechanism. These results strongly indicate that self-organization of a small number of different proteins is used in living cells to generate spatio-temporal structures. From physics at bgu.ac.il Mon Nov 3 15:13:54 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-18 Physical Chemistry Seminar Message-ID: <200811031313.PAA918028@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 18-11-2008 TIME: 15:30pm(Tue) PLACE: Bldg. 54, Room 207 (physics Department seminar room) TITLE: Optical magnetometers: advances and applications (including nuclear magnetic resonance) SPEAKER: Prof. Dmitry Budker, Department of Physics, University of California at Berkeley and Nuclear Science Division, LBNL ABSTRACT/COMMENTS: I will describe the physics of and recent advances in optical magnetometers. One recent area of application of these devices is signal detection in nuclear magnetic resonance (NMR) and magnetic-resonance imaging (MRI). As an example, I will describe our recent work on the zerofield measurements of the scalar (\"J\") couplings between hetero- and homonuclear spins in various molecules. From physics at bgu.ac.il Thu Nov 6 15:07:36 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-19 Astrophysics and Cosmology Seminar Message-ID: <200811061307.PAA1167251@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 19-11-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: Accretion disk spectrum of Quasar to nano-Quasar: Theory confronts Observation SPEAKER: Dr. Samir Mandal , BGU University ABSTRACT/COMMENTS: We study the spectrum of two component accretion flows around black holes which may or may not have jets and outflows with a Keplerian accretion disk on the equatorial plane surrounded by a sub-Keplerian disk. We discuss the spectral properties of the accretion disk around a stellar mass black hole as well as super-massive black hole. This helps us to understand the basic physical nature of the flow from an unifying view by varying only the mass of the black hole. we show that the soft photons emitted by the Keplerian component and the synchrotron radiation from the pre-shock or the post- shock sub-Keplerian component are inverse Comptonized by the thermal and shock-accelerated non-thermal electrons in the post-shock region. The resulting photons can have energy till a few MeV as is observed in several black hole candidates. We fit the observed spectra of Cyg X-1 and M87 by our model spectrum. From aaharony at bgu.ac.il Mon Nov 10 12:16:05 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-24 Condensed Matter Seminar Message-ID: <200811101016.MAA1476301@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 24-11-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: In search for the neural code SPEAKER: Prof. Maoz Shamir, Department of Physiology, Ben-Gurion University of the Negev ABSTRACT/COMMENTS: In my talk I will review the state of the art theoretical understanding of the neural code. I will explain the theoretical methodology and the theoretical approaches for addressing this problem. I will describe the effects of neuronal noise correlations on the accuracy of the code and highlight neuronal heterogeneity and response variability as possible primary sources of information in the central nervous system. Time permitting; I will talk on temporal coding in the central nervous system and Winner-Take-All readout mechanisms. From physics at bgu.ac.il Mon Nov 10 12:31:15 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-24 Condensed Matter Seminar Message-ID: <200811101031.MAA1472267@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 24-11-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: In search for the neural code SPEAKER: Prof. Maoz Shamir, Department of Physiology, BGU ABSTRACT/COMMENTS: In my talk I will review the state of the art theoretical understanding of the neural code. I will explain the theoretical methodology and the theoretical approaches for addressing this problem. I will describe the effects of neuronal noise correlations on the accuracy of the code and highlight neuronal heterogeneity and response variability as possible primary sources of information in the central nervous system. Time permitting; I will talk on temporal coding in the central nervous system and Winner-Take-All readout mechanisms. From physics at bgu.ac.il Mon Nov 10 12:33:23 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-19 Physical Chemistry Seminar Message-ID: <200811101033.MAA1480846@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 19-11-2008 TIME: 16:00pm (Wed) PLACE: Bldg. 54, Room 207 (physics seminar room) TITLE: Exchange coupling of metal ions with the unquenched orbital SPEAKER: Prof. Boris Tsukerblat , Department of Chemistry, BGU ABSTRACT/COMMENTS: From gideonc at bgu.ac.il Mon Nov 10 13:49:22 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-17 Physics Colloquium Message-ID: <200811101149.NAA1478544@tzin.bgu.ac.il> Physics Colloquium DATE: 17-11-2008 TIME: 3:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Crossing the P and the T and doting the alpha: chasing small symmetry violations at Berkeley SPEAKER: Professor Dmitry Budker, Department of Physics University of California at Berkeley and Nuclear Science Division, LBNL ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq09_A/Budker.html From ibar at bgu.ac.il Tue Nov 11 08:32:21 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-18 Lasers Seminar Message-ID: <20081111063524.7CE57146BE5@smtp2.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 18-11-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Optical magnetometers: advances and applications (including nuclear magnetic resonance) SPEAKER: Prof. Dmitry Budker, Department of Physics, University of California at Berkeley and Nuclear Science Division, LBNL ABSTRACT/COMMENTS: I will describe the physics of and recent advances in optical magnetometers. One recent area of application of these devices is signal detection in nuclear magnetic resonance (NMR) and magnetic-resonance imaging (MRI). As an example, I will describe our recent work on the zerofield measurements of the scalar (\"J\") couplings between hetero- and homonuclear spins in various molecules. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081111/d3970e49/attachment.htm From physics at bgu.ac.il Sun Nov 16 16:59:26 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-11-20 Physics Colloquium Message-ID: <200811161459.QAA1979991@tzin.bgu.ac.il> Physics Colloquium DATE: 20-11-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Effect of Elasticity and Thermal Fluctuations on Binding of Proteins to DNA SPEAKER: Prof. Yitzhak Rabin, Dept. of Physics, Bar Ilan University ABSTRACT/COMMENTS: Some bacterial (HU) proteins are known to bend DNA at low concentrations but straighten it at high concentrations. We present an exactly solvable model in which the binding of proteins affects the local spontaneous curvature of DNA and use it to calculate the concentration dependence of the effective persistence length, site occupancy, and cooperativity parameters. We reproduce the experimentally observed non-monotonic variation of the persistence length with protein concentration and predict deviations of the binding isotherm from the standard Langmuir shape. We show that the latter effect is a direct consequence of the fact that the density of states associated with bending fluctuations increases with spontaneous curvature. From aaharony at bgu.ac.il Tue Nov 18 15:05:05 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:30 2009 Subject: [Phys-seminars] 2008-12-01 Condensed Matter Seminar Message-ID: <200811181305.PAA2163324@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 01-12-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Mean-field model for electron glass dynamics SPEAKER: Ariel Amir, Weizmann Institute, Rehovot ABSTRACT/COMMENTS: We study a system of localized interacting electrons, coupled to a phonon bath. This system is known as the electron glass, as it exhibits aging and memory effects. After presenting the model, I will describe the phenomena of the Coulomb gap, and show how this may modify Mott\'s variable range hopping. I will then present our model for the dynamics of the system, based on a mean-field approximation. After checking the predictions of the model at equilibrium, we apply it for the dynamics close to a locally stable (equilibrium) point, and show the system can be described the eigenvalue distribution of a certain matrix. The eigenvalue distribution diverges at low eigenvalues approximately as 1/f , leading to logarithmic decays in time. The model also predicts full aging, in consistence with the experimental results. From ibar at bgu.ac.il Tue Nov 18 17:29:56 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-11-25 Lasers Seminar Message-ID: <20081118152949.E6BCB146C29@smtp1.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 25-11-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Bose-Einstein condensation. Towards carbon nano-tube based wires SPEAKER: Mr. Shimi Machluf, Department of Physics, Ben Gurion University of the Negev ABSTRACT/COMMENTS: Atom chips are devices for trapping, manipulating and measuring ultra cold atoms for quantum technology and fundamental studies. In this talk I'll present an atom chip experimental apparatus which already achieved the phase transition to Bose-Einstein condensate (BEC). In addition I'll describe the future experiments that this experiment was built for, such as replacing one of the atom chip gold wires with a carbon nano tube. Such new materials, making up the engineered environment of the atom, offer reduced uncontrolled coupling to the atoms and thus suppress Casimir-Polder, potential corrugation, heating and decoherence. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081118/75777bc2/attachment.htm From physics at bgu.ac.il Thu Nov 20 14:01:09 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-11-26 Nanotechnology Workshop Message-ID: <200811201201.OAA2342407@tzin.bgu.ac.il> Nanotechnology Workshop DATE: 26-11-2008 TIME: 12:00 (noon) PLACE: Chemistry club (Building #29, room 306) TITLE: Insights into the mechanism of hearing micromechanics SPEAKER: Itay Rousso, Structural Biology Weizmann Institute of Science ABSTRACT/COMMENTS: From gideonc at bgu.ac.il Thu Nov 20 17:18:50 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-11-27 Physics Colloquium Message-ID: <200811201518.RAA2355775@tzin.bgu.ac.il> Physics Colloquium DATE: 27-11-2008 TIME: 14:05 (Thu) PLACE: W.A. Minkoff Senate Hall TITLE: The mean field theory of spin glasses: the heruistic replica approach and recent rigorous results SPEAKER: Prof. Giorgio Parisi, University of Rome, Italy ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq09_A/Parisi.html From physics at bgu.ac.il Mon Nov 24 10:39:03 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-11-26 Astrophysics and Cosmology Seminar Message-ID: <200811240839.KAA2676751@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 26-11-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: Disk and spheroid formation in the cosmological context SPEAKER: Dr. Frederic Bournaud, CEA Saclay France ABSTRACT/COMMENTS: From aaharony at bgu.ac.il Mon Nov 24 16:12:28 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-08 Condensed Matter Seminar Message-ID: <200811241412.QAA2695158@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 08-12-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Covalency effects on the magnetism of EuRh2P2 SPEAKER: Dr. Robert Schmitz, Ben Gurion University ABSTRACT/COMMENTS: In experiments, the ternary Eu pnictide EuRh2P2 shows an unusual coexistence of a non-integral Eu valence of about 2.2 and a rather high Neel temperature of 50 K. We present a model which explains the non-integral Eu valence via covalent bonding of the Eu 4f-orbitals to P2 molecular orbitals. In contrast to intermediate valence models where the hybridization with delocalized conduction band electrons is known to suppress magnetic ordering temperatures to at most a few Kelvin, covalent hybridization to the localized P2 orbitals avoids this suppression. Using perturbation theory we calculate the valence, the high temperature susceptibility, the Eu single-ion anisotropy and the superexchange couplings of nearest and next-nearest neighbouring Eu ions. The model predicts a tetragonal anisotropy of the Curie constants. We suggest an experimental investigation of this anisotropy using single crystals. >From experimental values of the valence and the two Curie constants, the three free parameters of our model can be determined. From physics at bgu.ac.il Tue Nov 25 10:54:33 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-03 Astrophysics and Cosmology Seminar Message-ID: <200811250854.KAA2757906@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 03-12-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: \"How Empty is Space?\" SPEAKER: Doron Chelouche, Canadian Institute for Theoretical Astrophysics (CITA) University of Toronto ABSTRACT/COMMENTS: There is good reason to believe that a fair fraction of the baryon mass in our Universe is in the form of very dilute and diffuse gas, making its detection challenging. Large astronomical surveys, such as the Sloan Digital Sky Survey (SDSS) and the upcoming Large Synoptic Survey Telescope (LSST), provide new means by which such material may be studied. This talk will review our current understanding in the field and focus on recent results pertaining to the dust content of our Universe. Implications for galaxy formation and evolution, as well as for high-precision cosmology will be discussed. From physics at bgu.ac.il Tue Nov 25 12:31:23 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-10 Astrophysics and Cosmology Seminar Message-ID: <200811251031.MAA2764975@tzin.bgu.ac.il> Astrophysics and Cosmology Seminar DATE: 10-12-2008 TIME: 12:00 noon (Wed) PLACE: Physics building (#54) room 207 TITLE: A shallow-water theory of annular sections of cold astrophysical disks SPEAKER: Dr. Orkan Umurhan , School of Mathematical Sciences, Queen Mary University of London ABSTRACT/COMMENTS: Astrophysical disks are characterized by order unity Rossby numbers. This makes the analysis of their vortical disturbances difficult to perform in terms of classical geostrophic flow approximations. In this study a scaling analysis is motivated and an asymptotic reduction of the equations of motion are presented which addresses this issue. The resulting equations describe motion which is geostrophic in the radial and hydrostatic in the vertical. An analysis of a series of simple problems is presented. In one problem an incarnation of the stratorotational instability is recovered. In another, the nonlinear evolution of an unstable Rossby wave is studied using weakly nonlinear techniques (single-wave theory). A discussion is presented discussing both the limitations of the theory and future directions. From ibar at bgu.ac.il Wed Nov 26 08:23:48 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-02 Lasers Seminar Message-ID: <20081126062349.242E5146C8D@smtp1.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 02-12-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Factorization of Numbers with Physical Systems SPEAKER: Prof. Ilya Averbukh, Department of Chemical Physics, Weizmann Institute of Science ABSTRACT/COMMENTS: Factorization of numbers has attracted a wide interest in pure arithmetics as well as for important applications, such as cryptography and e-commerce. In the present talk, I shall discuss some recent ideas proposed for experimental implementation of the so-called Gauss sums that are instrumental to the problem of finding prime factors of any integer N. Quantum interference effects in the dynamics of laser-driven atoms/molecules show a deep connection with number theory. A Gauss sum naturally emerges from the interference of multiple quantum excitation paths where each path is weighted by a quadratic phase factor. I shall overview several recent experimental realizations of the Gauss sum factorization algorithm in various systems (NMR, cold atoms interferometer, and ultra-fast optics). Although these "analog" computational schemes scale exponentially as a function of the number of digits of N, they have already allowed to factorize numbers as large as N = 1340333404807 = 11003 x 11027 x 11047. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081126/a123957b/attachment.htm From physics at bgu.ac.il Thu Nov 27 12:29:06 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-11-27 Physics Colloquium Message-ID: <200811271029.MAA2949053@tzin.bgu.ac.il> Physics Colloquium DATE: 27-11-2008 TIME: 14:05pm (Thu)* PLACE: W.A. Minkoff Senate Hall* TITLE: The mean field theory of spin glasses: the heruistic replica approach and recent rigorous results SPEAKER: Prof. Giorgio Parisi, University of Rome, Italy ABSTRACT/COMMENTS: *Notice the change of place and time From physics at bgu.ac.il Thu Nov 27 12:41:53 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-03 Physical Chemistry Seminar Message-ID: <200811271041.MAA2952569@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 03-12-2008 TIME: 16:00pm (Wed) PLACE: Physics building (#54) room 207 TITLE: \"Design principles of protein interaction specificity and plasticity\" SPEAKER: Dr. Dima Lukatsky, Department of Chemistry,BGU ABSTRACT/COMMENTS: From gideonc at bgu.ac.il Thu Nov 27 14:38:45 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-04 Physics Colloquium Message-ID: <200811271238.OAA2956483@tzin.bgu.ac.il> Physics Colloquium DATE: 04-12-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Semi-linear response theory of energy absorption: from electronic systems to cold atom physics SPEAKER: Prof. Doron Cohen, Department of Physics, BGU ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq09_A/Cohen.html Refreshments are served at 3:20pm From physics at bgu.ac.il Mon Dec 1 09:40:34 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-03 Nanotechnology Workshop Message-ID: <200812010740.JAA3288729@tzin.bgu.ac.il> Nanotechnology Workshop DATE: 03-12-2008 TIME: 12:00pm (Wed) PLACE: Chemistry club (Building #29, room 306) TITLE: Porous Silicon Nanostructures: from Science to Applications SPEAKER: Amir Sa’ar , Racah Institute of Physics and the Center for Nanoscience and Nanotechnology The Hebrew University ABSTRACT/COMMENTS: From aaharony at bgu.ac.il Mon Dec 1 13:57:35 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-15 Condensed Matter Seminar Message-ID: <200812011157.NAA3311019@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 15-12-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Millimeter scale robots driven by contractile heart cells: from locomotion to a heart-like pump. SPEAKER: Alex Feigel , Soreq NRC ABSTRACT/COMMENTS: Miniature robots require small motors and compact energy sources. Nature solves these problems by creating contractile cells, such as cardiomyocytes. A layer of these cells generates forces as strong as 4 millinewtons per square millimeter, enough to deform a thin (~10 μm) polymer film suspended in a liquid. It opens an avenue for the design and fabrication of autonomous robots from polydimethylsiloxane (PDMS) films covered by cardiomyocytes. Locomotion of a triangular swimmer and beating of a heart-like PDMS bubble (10 μm thick and 0.5 cm diameter) will be demonstrated. The fabrication process relies on unique characteristics of heart cells and micro-fluidic technologies. From dcohen at bgu.ac.il Tue Dec 2 06:47:28 2008 From: dcohen at bgu.ac.il (Doron Cohen) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-02 Math conference on Stochastic analysis Message-ID: <4934BDE0.1030507@bgu.ac.il> I am organizing a conference tomorrow and the day after tomorrow, and I should have told the dpt of physics. The title of the conference is Stochastic analysis and mathematical finance, but part of the talks should be of interest to your dpt. I have in mind in particular the talk of Prof. Ustunel, who will speak tomorrow on: A necessary and sufficient condition for invertibility of adapted perturbations of identity on the Wiener space Abstract: Let (W,H, ?) be the classical Wiener space, assume that U = IW +u is an adapted perturbation of identity satisfying the Girsanov identity. Then, U is invertible if and only if the kinetic energy of u is equal to the relative entropy of the measure induced with the action of U on the Wiener measure The homepage of the conference is at: http://www.math.bgu.ac.il/dany/conf_sp.html Please note that Prof. Ustunel's talk is at 14h15 and not 14h30. Could you forward this information to your dpt. Thanks a lot Daniel From nano at bgu.ac.il Tue Dec 2 11:24:59 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-03 nanotechnology seminar Message-ID: Nanotechnology Seminar, Wednesday 3.12.08, 12:00 building 29, room 306,Chemistry Department seminar room Porous Silicon Nanostructures: from Science to Applications Amir Sa?ar Racah Institute of Physics and the Center for Nanoscience and Nanotechnology The Hebrew University Abstract: Porous Silicon (PS) belongs to an interesting class of semiconductor nanostructures that manifest unusual physical, chemical and optical properties that can be utilized for developing novel materials and devices with applications in various fields such as photonics, electronics and bio-chemical sensors. Surprisingly, while properties of bulk silicon are among the best known to scientists, its electrochemistry to create PS is still considered to be alchemy and the optical properties of PS, particularly its room temperature photoluminescence are still under debate. This is partly due to the multi-disciplinary aspects of the field where physics meets chemistry and materials science (on the surface of the PS nanostructures). In my talk, I'll review some of the most peculiar properties of PS, from the preparation of "quantum sponge" micro-PS to ordered arrays of two- and three- dimensional macro-PS photonic crystals and recent developments in creating composite PS nanostructures. On the applications size I'll describe recent developments in developing active photonic crystals in silicon and composite PS nanostructures for chemical and bio-chemical sensing. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081202/cb63ad80/attachment.htm From ibar at bgu.ac.il Wed Dec 3 08:23:53 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-09 Lasers Seminar Message-ID: <20081203062353.D539A146BBA@smtp2.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 09-12-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Remote detection and identification of chemicals with LIDAR systems SPEAKER: Dr. Shlomo Fastig, Electro-Optics Div., Soreq NRC ABSTRACT/COMMENTS: Heavily industrial areas are characterized by multiple sources of pollution creating a complex environment containing aerosols, gases and bio materials in both continuous and catastrophic release scenarios. Hence remote detection and identification is of a very high importance with respect to environmental pollution. Various optical interactions schemes have been employed for that matter among which the most applied were resonant absorption, Raman scattering and Laser induced fluorescence. Active remote sensing with LIDAR systems (optical analog to RADAR), has been proven to be an efficient way to remotely detect, identify and monitor various pollutants in the atmosphere. The presentation will discuss the basic of active remote sensing and systems developed at Soreq NRC. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081203/a9f83edf/attachment.htm From nano at bgu.ac.il Wed Dec 3 09:43:03 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-03 Reminder-Nanotechnology seminar Message-ID: Nanotechnology Seminar, Wednesday 3.12.08, 12:00 building 29, room 306,Chemistry Department seminar room Porous Silicon Nanostructures: from Science to Applications Amir Sa?ar Racah Institute of Physics and the Center for Nanoscience and Nanotechnology The Hebrew University Abstract: Porous Silicon (PS) belongs to an interesting class of semiconductor nanostructures that manifest unusual physical, chemical and optical properties that can be utilized for developing novel materials and devices with applications in various fields such as photonics, electronics and bio-chemical sensors. Surprisingly, while properties of bulk silicon are among the best known to scientists, its electrochemistry to create PS is still considered to be alchemy and the optical properties of PS, particularly its room temperature photoluminescence are still under debate. This is partly due to the multi-disciplinary aspects of the field where physics meets chemistry and materials science (on the surface of the PS nanostructures). In my talk, I'll review some of the most peculiar properties of PS, from the preparation of "quantum sponge" micro-PS to ordered arrays of two- and three- dimensional macro-PS photonic crystals and recent developments in creating composite PS nanostructures. On the applications size I'll describe recent developments in developing active photonic crystals in silicon and composite PS nanostructures for chemical and bio-chemical sensing. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081203/7e76f74f/attachment.htm From idobd at bgu.ac.il Thu Dec 4 10:03:44 2008 From: idobd at bgu.ac.il (Ido Ben-Dayan) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-08 Particles and Fields Seminar Message-ID: ANNOUNCEMENT==> Particles and Fields Seminar DATE: 08-12-2008 TIME: 10:00am (Mon) PLACE: Physics building (#54) room 207 TITLE: Dark Energy, Inflation and Extra Dimensions - Free Discussion SPEAKER: Ido Ben-Dayan, BGU ABSTRACT/COMMENTS: I would like to discuss a recent work by Steinhardt and Wesley arXiv:0811.1614 which carries the title of the talk. They claim that in a theory with compact dimensions which obeys the null energy condition (NEC) inflation is impossible and dark energy phase is possible only if Newton's constant and the equation of state parameter vary with time. For theories that do violate the NEC, an accelerated cosmic expansion is possible only if the NEC-violating elements are inhomogeneously distributed in thecompact dimensions and vary with time in precise synchrony with the matter and energy density in the non-compact dimensions. These claims seem to be important, and the key ingredient is whether their assumptions are reasonable or not. I will state the theorems and their assumptions and would like to hear the opinion of the audience regarding these issues. ? -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081204/91f15e92/attachment.htm From gideonc at bgu.ac.il Thu Dec 4 19:40:55 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-11 Physics Colloquium Message-ID: <200812041740.TAA3595884@tzin.bgu.ac.il> Physics Colloquium DATE: 11-12-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Encoding of color information by the retina SPEAKER: Dr. Ronen Segev, Department of Life Sciences, Ben Gurion University ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq09_A/Segev.html Refreshments are served at 3:20pm From nano at bgu.ac.il Sun Dec 7 11:53:10 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-10 No nanotechnology seminar Message-ID: <705B25909BC34AA9977E580F59D6E309@estinano> Regretfully, this week won't be a seminar of nanotechnology. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081207/2f975f7a/attachment.htm From nano at bgu.ac.il Sun Dec 7 13:19:45 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-09 Joint seminar-chemical engineering dep. and nanotechnology Message-ID: Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: image/gif Size: 73 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081207/b236dcf7/attachment.gif From physics at bgu.ac.il Sun Dec 7 15:14:59 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-09 Joint Seminar: Chemical Eng.&Nano Message-ID: <200812071314.PAA3842454@tzin.bgu.ac.il> Joint Seminar: Chemical Eng.&Nano DATE: 09-12-2008 TIME: 15:00pm (Tue) PLACE: building 59, room 235,Chemical Engineering Department seminar room TITLE: Block Copolymer Aggregates in Bio-Medical Applications Labeling, Imaging, and Filling/Release of Ingredients SPEAKER: Adi Eisenberg, McGill University Montreal, Canada ABSTRACT/COMMENTS: The visualization of sub-cellular localization of block copolymer micelles has been of increasing interest in the past decade. This interest has been motivated largely by the use of block copolymer micelles as delivery vehicles for hydrophobic drugs. In this presentation, methods are reviewed which are based on resolution achievable by optical microscopy on the one hand and electron microscopy on the other. For resolution at the optical microscopy level, the micelles can be conjugated with a fluorescent dye such as Rhodamine or Fluorescein attached to the end of the hydrophobic block. Specific subcellular compartments can also be labeled with specific dyes. Subcellular localization of the micelles can be followed by a superposition of the colors of the labeled micelles and the cell compartments. If it is desired to follow the internalization with a resolution of the type achieved by electron microscopy, the micelles can be tagged with quantum dots such as gold, among others. Using this approach, the visualization of micelles in sub-cellular compartments can be obtained with a resolution of a few nanometers. Colloidal gold nanoparticles incorporated in poly(4-vinylpyridine)-b-poly(ethylene oxide) micelles were developed to explore micelle fate by electron microscopy. Filling and release of ingredients is discussed for both micelles and vesicles. Several examples of filling and release in micelles are given, as well as one example of a study of recovery from a sciatic nerve crush involving FK 506 in rats. Finally, one example is given of active loading of Doxorubicin into block copolymer vesicles, with the added advantage of control of release kinetics by wall plasticization. From aaharony at bgu.ac.il Mon Dec 8 11:10:06 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-22 Condensed Matter Seminar Message-ID: <200812080910.LAA3897444@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 22-12-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Freeze control by ice binding proteins SPEAKER: Prof. Ido Braslavsky, Department of Physics and Astronomy Ohio Univ., Athens ,Ohio, 45701,USA ABSTRACT/COMMENTS: Ice binding proteins (IBPs) are proteins that interfere with ice growth. While some IBPs promote nucleation of ice, and are thus called ice nucleation proteins, others prevent the growth of ice, and are thus called antifreeze proteins (AFPs). IBPs protect organisms from freezing injury and have many potential applications in medicine and agriculture. Such proteins could potentially serve as a platform for future applications in which crystal growth is manipulated by specific additives. Controlling ice formation is essential for life in cold environments and may therefore play an important role in the search for extraterrestrial life. Although the first AFP was found 40 years ago, the way in which these proteins function is still not completely resolved. To resolve some of the key issues regarding the interactions between AFPs and ice, we developed a new approach for investigating the activity of AFPs that relies on fluorescence microscopy and dynamic control of the solvent around ice crystals with the aid of microfluidic devices. One of the interesting questions in this field is why certain AFPs are \"hyperactive\". AFPs can be classified into two groups: moderate ones that can depress the freezing point by ~1.0 0C and hyperactive ones that can depress the freezing point by several degrees Celsius even when present at low concentrations. I will present experimental results based on fluorescence microscopy of AFP-bound ice crystals that highlight the differences between moderate and hyperactive AFPs. These include direct evidence for the basal plane affinity of hyperactive AFPs, the effects of AFPs on the growth-melt behavior of ice, the dynamics of their interaction with ice, the nature of the bonding between AFPs and ice, and the ability of AFPs to inhibit melting of ice under superheated conditions. From ibar at bgu.ac.il Wed Dec 10 08:33:48 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-16 Lasers Seminar Message-ID: <20081210063356.68E90146BFF@smtp1.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 16-12-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Magnetic interactions of ultra-cold atoms near surfaces SPEAKER: Mr. Tal David, Atom Chip Group, Department of Physics, Ben-Gurion University of the Negev, Beer Sheva ABSTRACT/COMMENTS: In this talk I will present some of the research we have conducted in the Atom Chip lab at Ben-Gurion University of the Negev. We have constructed an experimental apparatus to study atom optics near a surface, and obtained the milestone of Bose-Einstein condensation. In parallel with the experimental work in the lab, we have theoretically studied magnetic interactions of cold atoms near surfaces. We have developed a generalized theory for the coupling of cold atoms trapped microns from the surface, to thermal near-field radiation originating from the random motion of finite-temperature electrons within the surface. I will discuss the suppression of harmful effects caused by this coupling (trap loss, heating, and decoherence), by use of special materials for current carrying structures on the atom chip surface, or by lowering the surface temperature. I will describe our recent finding that decoherence can be suppressed by orders of magnitude even at room temperature. In addition, I will discuss the application of ultra-cold atom magnetometry to surface microscopy of current carrying thin polycrystalline Au wires. With this technique, having high sensitivity and spatial resolution, we have gained new insight on the transport properties of electron scattering in such wires, having imperfections due to the fabrication process. In a joint study with the Vienna atom chip group, we have analyzed the experimental data and developed a theoretical model, starting from basic physical relations. We predict a significant reduction of potential corrugation when using wires made of electrically anisotropic materials. The theoretical work described here was driven and motivated by our experimental work and design, and is the basis for near-future experiments in our group. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081210/08c4d197/attachment.htm From nano at bgu.ac.il Wed Dec 10 15:16:02 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-17 Nanotechnology seminar Message-ID: <75F07D080659464E89123C7F8395DC60@estinano> Nanotechnology Seminar, Wednesday 17.12.08, 12:00 building 29, room 306,Chemistry Department seminar room Surface Chemistry of Nanostructures: Deployment, Assembly and Doping Roie Yerushalmi Institute of Chemistry and the Center for Nanoscience and Nanotechnology The Hebrew University of Jerusalem Abstract: Nano-materials have been the subject of major scientific and technological advances in the last decade. The remarkable progress in nanostructure synthesis resulted in vast diversity of readily accessible materials with highly controlled composition, dimensions and physical properties. However, demonstrating a generic approach for large-scale and selective deployment of nano-objects of different materials and geometrical aspect ratios is still a challenge. Another hurdle in the field of nanomaterials is the post-growth control of chemical composition. In particular, this limitation presents a challenge for controllable doping of nanostructures. In my talk I will present recent advances that afford facile and generic assembly strategies of nanostructures with highly controlled density, alignment and composition by utilizing the surface chemistry and surface engineering of nanostructures. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081210/30021d69/attachment.htm From dcohen at bgu.ac.il Thu Dec 11 10:13:28 2008 From: dcohen at bgu.ac.il (dcohen@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-23 Special Condensed Matter Seminar Message-ID: <200812110813.KAA4164879@tzin.bgu.ac.il> Special Condensed Matter Seminar DATE: 23-12-2008 TIME: 11:00am (Tue) PLACE: Physics building (#54) room 207 TITLE: Properties of Complex Oxides at the nanoscale: First Order Phase Transitions through Avalanches. SPEAKER: Amos Sharoni, Department of Physics, University of California- San Diego ABSTRACT/COMMENTS: Properties of complex oxides have been fascinating the physical world for decades, including many materials which have a phase transition, among which are high temperature superconductors, multiferroics, and metal insulator transition (MIT) materials. We have studied a member of the later group, vanadium oxide (VO2), which in spite of been known for decades, keeps surprising researchers today. We find that the MIT of nano-scaled VO2 devices is drastically different from the smooth transport curves generally reported. The temperature driven transition occurs through a series of resistance jumps ranging over 2 decades in magnitude, showing a scaling behavior, similar to those obtained in martensitic transitions or Barkhausen noise in ferromagnets. We will discuss the distribution of resistance avalanches and their relation to the percolative nature of the measurement. Attention will be given to the effect of the VO2 junction dimensions and of the transport measurement conditions, such as applied current and temperature ramp rate. In addition, by performing first order reversal curve (FORC) measurements of the hysteresis in macroscopic VO2 films, we find evidence for interactions between these phase-separated domains. In this light, we discuss a model for the hysteresis which is intrinsically different from the Preisach model that is usually used to describe hysteresis. From avardi at bgu.ac.il Sun Dec 14 09:40:33 2008 From: avardi at bgu.ac.il (avardi@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-17 Physical Chemistry Seminar Message-ID: <200812140740.JAA4426448@tzin.bgu.ac.il> Physical Chemistry Seminar DATE: 17-12-2008 TIME: 4:00pm (Wed) PLACE: Physics Seminar Room TITLE: Quantum entanglement, quantum fluctuations, and the uncertainty principle. SPEAKER: Prof. Ramy Brustein, Department of Physics, Ben-Gurion University of the Negev ABSTRACT/COMMENTS: From gideonc at bgu.ac.il Sun Dec 14 09:45:25 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-18 Physics Colloquium Message-ID: <200812140745.JAA4419590@tzin.bgu.ac.il> Physics Colloquium DATE: 18-12-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Biological strategies of skeletal assembly and disassembly A lesson in nanotechnology SPEAKER: Prof. Lia Addadi, Dept. of Structural Biology, Weizmann Institute of Science ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq09_A/Addadi.html Refreshments are served at 3:20pm From ibar at bgu.ac.il Tue Dec 16 17:57:00 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-23 Lasers Seminar Message-ID: <20081216155706.D8358AB8A7@smtp2.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 23-12-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Towards adiabatic magnetic deceleration and molecular cooling SPEAKER: Dr. Ed Narevicius, Chemical Physics Department, Weizmann Institute of Science ABSTRACT/COMMENTS: I will present a new method, an atomic and molecular coilgun, which allows for comprehensive control over atomic and molecular motion. Results of stopping supersonic beams of metastable neon and molecular oxygen via interaction with pulsed magnetic fields will be presented. A possible solution for cooling of molecules near the single photon recoil limit will be discussed. 1. Narevicius, E., A. Libson, C.G. Parthey, I. Chavez, J. Narevicius, U. Even, and M.G. Raizen, Stopping supersonic beams with a series of pulsed electromagnetic coils: An atomic coilgun. Physical Review Letters, 2008. 100(9): p. 093003. 2. Narevicius, E., A. Libson, C.G. Parthey, I. Chavez, J. Narevicius, U. Even,and M.G. Raizen, Stopping supersonic oxygen with a series of pulsed electromagnetic coils: A molecular coilgun. Physical Review A, 2008. 77(5): p. 051401(R). -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081216/e87c0823/attachment.htm From nano at bgu.ac.il Wed Dec 17 10:15:12 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-17 Reminder: Nanotechnology seminar Message-ID: <035A6B6FD0F3418AB302635929399328@estinano> Nanotechnology Seminar, Wednesday 17.12.08, 12:00 building 29, room 306,Chemistry Department seminar room Surface Chemistry of Nanostructures: Deployment, Assembly and Doping Roie Yerushalmi Institute of Chemistry and the Center for Nanoscience and Nanotechnology The Hebrew University of Jerusalem Abstract: Nano-materials have been the subject of major scientific and technological advances in the last decade. The remarkable progress in nanostructure synthesis resulted in vast diversity of readily accessible materials with highly controlled composition, dimensions and physical properties. However, demonstrating a generic approach for large-scale and selective deployment of nano-objects of different materials and geometrical aspect ratios is still a challenge. Another hurdle in the field of nanomaterials is the post-growth control of chemical composition. In particular, this limitation presents a challenge for controllable doping of nanostructures. In my talk I will present recent advances that afford facile and generic assembly strategies of nanostructures with highly controlled density, alignment and composition by utilizing the surface chemistry and surface engineering of nanostructures. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081217/841ee554/attachment.htm From physics at bgu.ac.il Thu Dec 18 12:50:45 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-25 Physics Colloquium Message-ID: <200812181050.MAA4794699@tzin.bgu.ac.il> Physics Colloquium DATE: 25-12-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Dept. of Physics University of Maryland SPEAKER: Prof. J. Robert Dorfman, Kinetic Theory for Fun and Profit ABSTRACT/COMMENTS: Kinetic theory of dilute and moderately gases has developed in a way that was not anticipated by the early workers in the field, such as Bogoliubov, Uhlenbeck and others. They based their intuition on the equilibrium properties of such gases, which turns out to be essentially irrelevant for understanding important features of transport processes in gases. The talk will review some of the interesting developments in the theory over the last few decades and mention some related experimental results. If time permits, some recent applications of kinetic theory to a study of chaotic properties of hard sphere gases will be discussed. From physics at bgu.ac.il Thu Dec 18 15:35:36 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-25 Physics Colloquium Message-ID: <200812181335.PAA4806218@tzin.bgu.ac.il> Physics Colloquium DATE: 25-12-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Kinetic Theory for Fun and Profit SPEAKER: Prof. J. Robert Dorfman, Dept. of Physics, University of Maryland ABSTRACT/COMMENTS: Kinetic theory of dilute and moderately gases has developed in a way that was not anticipated by the early workers in the field, such as Bogoliubov, Uhlenbeck and others. They based their intuition on the equilibrium properties of such gases, which turns out to be essentially irrelevant for understanding important features of transport processes in gases. The talk will review some of the interesting developments in the theory over the last few decades and mention some related experimental results. If time permits, some recent applications of kinetic theory to a study of chaotic properties of hard sphere gases will be discussed. From nano at bgu.ac.il Thu Dec 18 16:06:33 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-24 nanotechnology seminar Message-ID: <8A305633A5DD4E8FAB47959B155241E1@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: image/jpeg Size: 6920 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081218/590b6648/attachment.jpg From gideonc at bgu.ac.il Thu Dec 18 17:18:41 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-25 Physics Colloquium Message-ID: <200812181518.RAA4813080@tzin.bgu.ac.il> Physics Colloquium DATE: 25-12-2008 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Kinetic Theory for Fun and Profit SPEAKER: Prof. J. Robert Dorfman, Department of Physics, University of Maryland ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq09_A/Dorfman.html Refreshments are served at 3:20pm From dcohen at bgu.ac.il Sat Dec 20 16:24:19 2008 From: dcohen at bgu.ac.il (dcohen@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-29 Condensed Matter Seminar Message-ID: <200812201424.QAA4984258@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 29-12-2008 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: The Factorization Approximation of the Master Equation for a non-Gaussian Bath SPEAKER: Dr. Uri Gavish, LPTHE, Universite Paris 6, Jussieu, Paris, France ABSTRACT/COMMENTS: A bath is said to have clustered correlations if any set of events, the latest of which occurs at time t_m is uncorrelated with any other set of events, the earliest of which occurs at time t_{m+1} provided that t_{m+1}-t_m is large enough. We show that the Master Equation for a system coupled to bath with clustered correlations is exact in the limit of a strongly Markovian bath. This result holds also for non-Gaussian baths for which Wick\'s theorem does not apply and for high-order Master equations that can be used to describe the decoherence of a system with a gap larger than the maximal frequency related to any single transition in the bath, as is (probably) the case for topologically protected qubit implemented with Josephson arrays. From dcohen at bgu.ac.il Sun Dec 21 10:58:33 2008 From: dcohen at bgu.ac.il (Doron Cohen) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-28 The Israel Physical Society Meeting Message-ID: <494E0539.4030709@bgu.ac.il> The Israel Physical Society will have its annual meeting at BGU on December 28th. Please look at the program: http://www.bgu.ac.il/physics/events/ips2008 From physics at bgu.ac.il Sun Dec 21 12:14:21 2008 From: physics at bgu.ac.il (physics@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-24 Nanotechnology Workshop Message-ID: <200812211014.MAA5050847@tzin.bgu.ac.il> Nanotechnology Workshop DATE: 24-12-2008 TIME: 12:00 (noon) PLACE: Chemistry club (Building #29, room 306) TITLE: Molecular Computation: Logic Gates within Synthetic peptide Networks SPEAKER: Prof Gonen Ashkenasy, Department of Chimestry BGU ABSTRACT/COMMENTS: From aaharony at bgu.ac.il Mon Dec 22 19:09:16 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2009-01-05 Condensed Matter Seminar Message-ID: <200812221709.TAA5191423@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 05-01-2009 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Directed flow in nonadiabatic stochastic pumps SPEAKER: Saar Rahav, Department of Chemistry, University of California at Irvine ABSTRACT/COMMENTS: Molecular machines are molecules that perform specific tasks. They are ubiquitous in biological systems. Remarkably, it is now feasible to construct and manipulate artificial molecular machines. The operation of a stochastic pump, molecular machine driven by variation of its parameters, is analyzed theoretically. We derive a formula for the integrated flow from one configuration to another. We show that for adiabatic variation of the parameters this probability current is given by a geometric expression. We also find a surprising no pumping theorem for cyclic processes in thermally activated systems. From ibar at bgu.ac.il Tue Dec 23 17:10:39 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-30 Lasers Seminar Message-ID: <20081223151047.96D5A146C88@smtp1.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 30-12-2008 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Z-ring dynamics in E. coli SPEAKER: Mr. Roman Tsukanov, Department of Physics, Ben Gurion University of the Negev ABSTRACT/COMMENTS: Although E. coli is the one of the simplest living organisms, its division process is not completely understood. Polymerization of Z-ring is the first event in E. coli cell division. Hence it is important to determine the timing of Z-ring appearance with high accuracy. We have developed a method for fluorescent image processing, Integral Profile Analysis (IPA), which is capable of determining the time and position for the Z-ring appearance within single E. coli cells. We find that the time of Z-ring assembly is correlated to the cell lifetime. Moreover, we measure the time delay between the Z-ring assembly and the start of the septum formation and show that it has a large variability from one cell to another. Finally, we monitor the position of the Z-ring during the division of individual cells. We find that the Z-ring precursor is highly mobile and once the ring is formed it settles down in the vicinity of the cell center. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081223/1682e725/attachment.htm From nano at bgu.ac.il Wed Dec 24 09:08:37 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-24 Remainder: nanotechnology seminar Message-ID: <09D149583C6B469986C59A614FDF58AD@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: image/jpeg Size: 6920 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081224/4ab4f6c4/attachment.jpg From dcohen at bgu.ac.il Wed Dec 24 19:49:23 2008 From: dcohen at bgu.ac.il (Doron Cohen) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2009-01-01 Special Chem-Eng Seminar Message-ID: <49527623.70305@bgu.ac.il> Speaker: Prof. Shigeyuki Komura Tokyo Metropolitan University Time & Place: 12:00, Thursday Jan. 1, 2009. Bldg 59, room 235 (Chemical Engineering seminar room) Title: Hydrodynamics in multicomponent biomembranes Abstract: We investigate the dynamics of critical fluctuations in binary fluid membranes using a two-dimensional hydrodynamic model with momentum decay to the surrounding water. In particular, the decay rate of concentration fluctuations is obtained analytically. In the limit of small wavenumber q with respect to the correlation length, the decay rate is proportional to q2, as usual. In the large-q limit, however, the effective diffusion coefficient increases only logarithmically with q. _____________________________ Yoav Tsori Dept. of Chemical Engineering Ben-Gurion University 84105 Beer-Sheva, Israel Tel (972)-8-6477794 Fax (972)-8-6472916 www.bgu.ac.il/~tsori From nano at bgu.ac.il Thu Dec 25 09:16:31 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-24 nanotechnology seminar Message-ID: <632CEF64D89C44008F970869868A32CD@estinano> Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: image/gif Size: 29385 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081225/c218f124/attachment.gif From nano at bgu.ac.il Thu Dec 25 09:24:31 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-31 nanotechnology seminar Message-ID: Skipped content of type multipart/alternative-------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: image/gif Size: 29385 bytes Desc: not available Url : http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081225/ca6683f2/attachment.gif From gideonc at bgu.ac.il Thu Dec 25 17:24:04 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2009-01-01 Physics Colloquium Message-ID: <200812251524.RAA5443822@tzin.bgu.ac.il> Physics Colloquium DATE: 01-01-2009 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: Thermo-magnetic instability of vortex matter in type II superconductors: Experiment and theory SPEAKER: Prof. Yuri Galperin, Department of Physics, University of Oslo ABSTRACT/COMMENTS: For abstract please enter the link below: http://physweb.bgu.ac.il/EVENTS/COLLOQ/collq09_A/Galperin.html Refreshments are served at 3:20pm From aaharony at bgu.ac.il Mon Dec 29 11:23:58 2008 From: aaharony at bgu.ac.il (aaharony@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2009-01-12 Condensed Matter Seminar Message-ID: <200812290923.LAA78822@tzin.bgu.ac.il> Condensed Matter Seminar DATE: 12-01-2009 TIME: 11:30am (Mon) PLACE: Physics building (#54) room 207 TITLE: Many-electron theory of 1/f-noise and memory effects in hopping conductance SPEAKER: Professor Yiri Galperin, Department of Physics, University of Oslo, Oslo, Norway ABSTRACT/COMMENTS: We show that 1/f-noise of conductance in the variable range hopping regime is related to transitions of many-electrons clusters (fluctuators) between two almost degenerate states. Giant fluctuation times necessary for 1/f-noise are provided by slow rate of simultaneous tunneling of many localized electrons and by large activation barriers for their consecutive rearrangements. These fluctuations in the many-electron clusters are “read out” by the hopping cluster responsible for the conductance. We analyze statistics of the many-electron clusters responsible for noise at very low frequencies and calculate noise spectrum and intensity. In a broad temperature interval, the Hooge parameter steeply grows with decreasing temperature because it is easier to find a slow fluctuator at lower temperatures. Our conclusions agree with the low temperature observations of 1/f-noise in p-type silicon and GaAs. We also discuss relation of the 1/f noise and the observed memory effects in hopping conductance due to slow rearrangements of many-electron clusters leading to formation of polarons close to the electron hopping sites. An abrupt variation in the gate voltage changes occupation n umbers of the hopping sites, which then slowly relax due to rearrangements of the clusters. As a result, the density of hopping states becomes time dependent leading to the excess time-dependent conductivity. 1. A. L. Burin, B. I. Shklovskii, V. I. Kozub, Y. M. Galperin, and V. Vinokur, Phys. Rev. B 74, 075205 (2006). 2. A. Glatz, V. M. Vinokur, and Y. M. Galperin, Phys. Rev. Lett. 98, 196401 (2007). 3. A. L. Burin, V. I. Kozub, Y. M. Galperin, V. Vinokur, Phys. Rev. B 78, 132201, (2008); Journ. Phys-Cond. Mat. 20, 244135 (2008). From idobd at bgu.ac.il Mon Dec 29 11:41:22 2008 From: idobd at bgu.ac.il (idobd@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2009-01-05 Particles and Fields Seminar Message-ID: <200812290941.LAA78429@tzin.bgu.ac.il> Particles and Fields Seminar DATE: 05-01-2009 TIME: 10:00pm (Mon) PLACE: Physics building (#54) room 207 TITLE: Inflationary multiverse and black hole complementarity SPEAKER: Heeseung Zoe, Korea Advanced Institue of Science and Technology ABSTRACT/COMMENTS: From dcohen at bgu.ac.il Tue Dec 30 12:01:36 2008 From: dcohen at bgu.ac.il (Doron Cohen) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2009-01-01 Special Chem-Eng Seminar - CANCELED Message-ID: <4959F180.6040107@bgu.ac.il> 2009-01-01 Special Chem-Eng Seminar ----> CANCELED From ibar at bgu.ac.il Tue Dec 30 17:10:04 2008 From: ibar at bgu.ac.il (ilana) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2009-01-06 Lasers Seminar Message-ID: <20081230151013.B3A30146C0B@smtp1.bgu.ac.il> ANNOUNCEMENT==> Lasers Seminar DATE: 06-01-2009 TIME: 3:30pm (Tue) PLACE: Physics building (#54) room 207 TITLE: Morphological Changes During the Cell Cycle of Escherichia Coli SPEAKER: Ms. Galina Reshes , Department of Physics, Ben Gurion University of the Negev ABSTRACT/COMMENTS: Bacteria are the simplest living organisms. In particular, the E. coli has been extensively studied and it has become one of the standard model systems in microbiology. However, optical microscopy studies of single E. coli have been limited by its small size, 1x3 ?m, not much larger than the optical resolution, ~ 0.25 ?m. As a result, not enough quantitative dynamical information on the life cycle of single E. coli is presently available. We suggest that, by careful analysis of images from phase contrast and fluorescence time-lapse microscopy, this limitation can be bypassed. For example, we show that applying this approach to monitoring morphogenesis in individual E. coli leads to a simple, quantitative description of this process. First, we find the time when the formation of the septum starts, ?c. It occurs much earlier than the time when the constriction can be directly observed by phase contrast. Second, we show that the E. coli grows in three linear regimes and that the corresponding growth rates are related to each other. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081230/c222253d/attachment.htm From nano at bgu.ac.il Wed Dec 31 10:23:01 2008 From: nano at bgu.ac.il (Nano) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2008-12-31- Cancelation-Nanotechnology Seminar Message-ID: The nanotechnology seminar planed for today (31.12.08) is cancelled, due to the unsecured situation. -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.bgu.ac.il/pipermail/phys-seminars/attachments/20081231/1ade9de9/attachment.htm From gideonc at bgu.ac.il Wed Dec 31 18:05:01 2008 From: gideonc at bgu.ac.il (gideonc@bgu.ac.il) Date: Tue Feb 17 13:18:31 2009 Subject: [Phys-seminars] 2009-01-01 Physics Colloquium - cancelled Message-ID: <200812311605.SAA281153@tzin.bgu.ac.il> Physics Colloquium - cancelled DATE: 01-01-2009 TIME: 3:30pm (Thu) PLACE: Physics building (#54) room 207 TITLE: The colloquium is cancelled this week SPEAKER: , ABSTRACT/COMMENTS: Refreshments are served at 3:20pm