Seminars

• Astrophysics and Cosmology Seminar

  Transient sources in galaxy cluster fields: Prospects for different gravitationally lensed transients

  Miriam Golubchik, BGU

  15 Jan 2025, 11:10 Sacta-Rashi Building for Physics (54), room 207

• Quantum optics seminar

  Roto-translational levitated optomechanics

  Marko Toros, University of Ljubljana

  15 Jan 2025, 16:00 Zoom Only

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.

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.

Seminars

• Astrophysics and Cosmology Seminar

  Transient sources in galaxy cluster fields: Prospects for different gravitationally lensed transients

  Miriam Golubchik, BGU

  15 Jan 2025, 11:10 Sacta-Rashi Building for Physics (54), room 207

• Quantum optics seminar

  Roto-translational levitated optomechanics

  Marko Toros, University of Ljubljana

  15 Jan 2025, 16:00 Zoom Only

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).

Condensed Matter Theory

Spin related mesoscopics

Amnon Aharony

*** Quantum mechanics of nanometer sized devices: using electron wave interference to manipulate electron motion. *** Spintronics: taking advantage of the electron’s magnetic moment (spin), and not only of its charge, to store and read information. Possible applications in quantum computers. *** Multiferroic materials are both magnetic and ferroelectric, and therefore can be manipulated by both electric and magnetic fields.

Seminars

• Astrophysics and Cosmology Seminar

  Transient sources in galaxy cluster fields: Prospects for different gravitationally lensed transients

  Miriam Golubchik, BGU

  15 Jan 2025, 11:10 Sacta-Rashi Building for Physics (54), room 207

• Quantum optics seminar

  Roto-translational levitated optomechanics

  Marko Toros, University of Ljubljana

  15 Jan 2025, 16:00 Zoom Only

High-Energy Physics

QCD at High Energies

Michael Lublinsky

Different resolution of the proton structure as probed by virtual photons in ep collisions.

We have entered the fascinating era of the Large Hadron Collider. The microscopic theory describing the structure of protons and nuclei is the theory of strong interactions, known as Quantum ChromoDynamics (QCD). Even though the fundamental theory is known, it is extremely difficult to deduce results of collision processes from first principle QCD calculations. This is due to complexity of the theory involving mutual interactions between gluons, the "photons" of strong interactions.

Condensed Matter Experimental

Mechanical properties on the nm scale

Yishay Manassen

Strain map from Gd islands and Local young modulus of nanoparticles.

The scanning tunneling microscope is a device capable of observing an image with atomic resolution and is capable of observing physical phenomena on the atomic scale. In this study we are interested in the nm scale mechanical properties, normally studied macroscopically, which can vary in different locations on the surface. These properties are the stress and strain tensors, the elastic constants, the surface energy and stress. These values can be measured either using a external perturbation (the STM tip) or internal perturbation (a heteroepitaxial island, chemical reaction).