Seminars

• Biological and soft-matter physics

  Nanoconfined fluids under strong electric fields

  Jacob Klein, Department of Materials and Interfaces, Weizmann Institute of Science

  01 Jun 2023, 11:00 SPECIAL SEMINAR - Joint with the dept. of Mechanical Engineering, Building # 55, Seminar Room # 117

Atomic, Molecular and Optical Physics

Quantum Interferences and Lasing without inversion

Reuben Shuker

Sub-natural-width peak

Quantum-interference-related phenomena have many implications in physics. Quantum interference between two independent quantum channels in three-level systems gives rise to various coherent phenomena, such as electromagnetically induced transparency (EIT), coherent population trapping (CPT), lasing/gain without inversion (LWI/GWI), enhancement of refraction index, sub- and super-luminal light propagation etc. These phenomena open a wide-range perspective for new type of phase-sensitive spectroscopy. An example is the possibility to get sub-natural line widths (see movie).

High-Energy Physics

Effective Theories and Quantum Gravity

Eran Palti

Effective theories are simplified physics models which neglect high-energy processes. If those theories include gravitational physics, then the omitted high-energy physics must include that of Quantum Gravity. Not all effective theories can be consistently completed at high energies into Quantum Gravity. Those which can are said to belong to the Landscape of effective theories. While those which cannot are said to belong to the Swampland of inconsistent theories. We study what are the criteria which differentiate an effective theory in the Landscape from one in the Swampland.

Seminars

• Biological and soft-matter physics

  Nanoconfined fluids under strong electric fields

  Jacob Klein, Department of Materials and Interfaces, Weizmann Institute of Science

  01 Jun 2023, 11:00 SPECIAL SEMINAR - Joint with the dept. of Mechanical Engineering, Building # 55, Seminar Room # 117

Biological and Soft Matter Physics

Nonlinear Dynamics and Biological Applications

Arik Yochelis

Biological systems show a plethora of fascinating self-organized behaviors that range from organ to cellular levels, such as spiral waves, pulses, synchronization, and steady states that are periodic in space. These non-equilibrium phenomena emerge through either spontaneous or forced symmetry breaking mechanisms. Employing nonlinear dynamics methods, we attempt to understand specific cases (localized waves in the inner ear) as well as gain general insights into the emergence of traveling waves with motivation taken from molecular motors, actin polymerization and cardiac system.

Condensed Matter Theory

Non-equilibrium steady state of low-dimensional systems

Doron Cohen

It is possible to induce non-equilibrium steady state current, which required e.g. a radiation source. We have studied the non-monotonic dependence of the current on the intensity of the driving, and its statistical properties. We also have addressed questions that concern the relaxation of such current, and how it depends on percolation and localization properties of the model.

Seminars

• Biological and soft-matter physics

  Nanoconfined fluids under strong electric fields

  Jacob Klein, Department of Materials and Interfaces, Weizmann Institute of Science

  01 Jun 2023, 11:00 SPECIAL SEMINAR - Joint with the dept. of Mechanical Engineering, Building # 55, Seminar Room # 117

Astrophysics and Cosmology

Gravitational Lensing and High Redshift Galaxies

Adi Zitrin

Galaxy Cluster Abell 370 and its famous gravitational arcs, imaged with the Hubble Space Telescope.

Massive galaxy clusters bend light rays from background sources to form magnified, distorted, and multiple arcs. Using this Gravitational Lensing phenomenon, we can map the Dark Matter distribution of the lens, invisible otherwise. Thanks to the magnification power from lensing we can also access increasingly fainter and high-redshift (earlier) galaxies, and study the evolution of the first generation galaxies and the Reionization of the Universe.

Condensed Matter Experimental

Magnetic Resonance on the single atom level

Yishay Manassen

above-silicon surface with carbide spots below tunneling junction and spin - spectrum

In the STM image shown, observed in our lab, we see some disordered white spots. The STM does not have chemical identification capability. Such chemical identification is observed macroscopically using macroscopic magnetic resonance – both of electrons and nuclei. We develop a magnetic resonance technique on the single atom level, observed via a Larmor frequency component in the tunneling current. We identify the type of atoms under the tip using their spectrum – for example the SiC hyperfine spectrum. Preliminary results showed the observation of the nuclear transitions (NMR) with the STM.