People Mail List

Name	Primary Category	Discipline
Adiel Etty	Administration
Agam Oded	Faculty	Condensed Matter Physics
Agranov Tal	Graduate Students	Nonlinear
Aharon Nati	Post-Docs	Condensed Matter Physics
Alpern Hen	Graduate Students	Condensed Matter Physics
Amusia Miron Ya	Emeriti	Condensed Matter Physics
Anahory Yonathan	Faculty	Condensed Matter Physics
Arad-Vosk Neta	Graduate Students	Condensed Matter Physics
Armon Tsafrir	Graduate Students	Nonlinear
Arviv Galya	Graduate Students

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Upcoming Events

Tomorrow

Frontier Physics Lecture: Chaos, Quantum Mechanics and Black Holes
- Start time: 06:00pm
- End date: Sunday, June 25th
- End time: 07:00pm
- Lecturer: Prof. Stephen Shenker
  Affiliation: Stanford University
  
  Abstract:
  Sometimes progress in science comes from finding new connections between fields previously thought to be quite distinct. In this lecture we will discuss, at a non-technical level, a connection uncovered in recent years between three deep concepts in physics: chaos, a property of physical systems, for example the weather, that makes their future behavior extremely difficult to predict; quantum mechanics, the basic framework for all known physical laws; and black holes, one of the most dramatic consequences of Einstein's theory of general relativity.
  
  Professor Shenker is a leading scientist in the study of the fundamental laws of nature and a former head of the Stanford Institute for Theoretical Physics. The lecture is intended for all members of the Faculty of Science and for science enthusiasts among the general public. Please see the attached poster.
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Monday, June 26th

Physics Colloquium: "Self Similar Explosions and their Astrophysical Applications"
- Start time: 12:00pm
- End date: Monday, June 26th
- End time: 01:30pm
- Lecturer: Mr. Almog Yalin
  Affiliation: Racah Institute of Physics
  The Hebrew University of Jerusalem
  
  Abstract:
  Explosions occur when a large amount of energy is deposited in a short period of time into a small hot spot. From that hot spot emerges a shock wave that moves out into the surrounding medium. The evolution of this shock wave is governed by the non - linear flow equations, and therefore, in general, cannot be solved analytically. However, the evolution of a strong explosion has a symmetry called self similarity, which greatly simplifies the equations to such extent that an analytic solution can be obtained.
  These solutions have been widely used in the astrophysical community to analyse explosions of stars (supernovae), and their effect on the interstellar medium. These analyses yielded predictions for light - curves, spectra and lifetimes of supernovae. In this talk I will review the theory of supernova explosions, and demonstrate how I use a similar approach in my research to study other astrophysical phenomena involving strong shocks.
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Physics Colloquium: "Shape and Shape Fluctuations of incompatible Ribbons"
- Start time: 12:00pm
- End date: Monday, June 26th
- End time: 01:30pm
- Lecturer: Mr. Doron Grossman
  Affiliation: Racah Institute of Physics
  The Hebrew University of Jerusalem
  
  Abstract:
  The Lecture's abstract can be found here.
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Tuesday, June 27th

Special Quantum Information Lecture: Engineering vibrationally-assisted energy transfer in a trapped-ion quantum simulator
- Start time: 12:00pm
- End date: Tuesday, June 27th
- End time: 01:30pm
- Lecturer: Dr. Eli Megidish
  Affiliation: The University of California, Berkeley
  
  Abstract:
  Charge and energy transfer are essential to many important processes in chemistry, biology and emerging nanotechnologies. Such transfer processes often occur in noisy thermal environments that strongly modify the transfer dynamics and, in some cases, even improve the transport efficiency or robustness. A prominent example is the energy transfer from pigments in light-harvesting complexes towards reaction centers, where efficiency is believed to critically depend on the spectral properties of the environment. In many cases, especially for structured, mesoscopic molecular environments, such noise – (or environmentally-) assisted transport processes are difficult to study analytically and numerically. Here we pursue a quantum simulation approach in which the phenomenon can be isolated and studied under fully-controlled conditions. We encode a noise-assisted transport process in a trapped-ion quantum simulator where energy transfer between ions is enhanced when coupled to their thermal vibrational motion. We observe transfer processes wherein the environment changes by an integer number of motional quanta. With the environment prepared near the ground state, we observe oscillatory energy transfer dynamics, indicating the non-Markovian nature of the environment. We demonstrate the ability to tune our quantum simulator into the non-perturbative parameter regimes often encountered in models of biochemical processes for which approximation methods fail.
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Astrophysics Seminar: Edge of darkness: The splashback radius as a physical halo boundary
- Start time: 12:30pm
- End date: Tuesday, June 27th
- End time: 01:30pm
- Lecturer: Dr. Benedikt Diemer
  Affiliation: Institute for Theory and Computation (ITC),
  Harvard-Smithsonian Center for Astrophysics (CfA), Harvard University
  
  Abstract:
  The radii and masses of dark matter halos are an essential input for models of galaxy formation, and for the interpretation of numerous observations. These radii are typically defined through an arbitrary overdensity threshold, largely because the density profiles of halos are thought not to have a well-defined edge. In this talk, I will show that the situation is more complicated: the outer profiles of halos depend on their dynamical state, and exhibit a novel feature called the splashback radius. I will argue for this radius as a physically motivated halo boundary and discuss recent observational and theoretical results supporting this notion. I will introduce a new analysis code that tracks billions of particle orbits in cosmological simulations in unprecedented detail. Based on the resulting measurements, I will demonstrate that the splashback radius contains complex information about halos that cannot be derived from conventional radius definitions.
  
  Additional details of the upcoming Astrophysics'
  seminars can be found on the following link.
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Wednesday, June 28th

Nonlinear Physics Seminar: How crack fronts create and respond to surface structure
- Start time: 12:00pm
- End date: Wednesday, June 28th
- End time: 01:30pm
- Lecturer: Mr. Itamar Kolvin
  Affiliation: Racah Institute of Physics,
  The Hebrew University of Jerusalem
  
  Abstract:
  
  Broken surfaces exhibit a dazzling variety of surface structures. Take a piece of a shattered glass and you'll find recorded on its surface: the tortuous path the crack took, waves emanating from the point of impact, steps – at times extremely delicate and at others jagged, and even colorful thin film interference – where the crack has split and left a small frustrated branch. Despite the impressive progress in our understanding of how cracks initiate and propagate, the study of fracture surfaces, Fractography, remains a largely qualitative science. Cracks are fast and surface detail is minute, making the observation of cracks while they form surface structure quite challenging.
  In this Seminar, I will describe how we alleviated these difficulties by breaking soft solids – gels – and directly visualizing the leading edge of the crack – the crack front. We explored two generic mechanisms for the formation of surface structure. At low crack velocities, the crack front spontaneously nucleates steps, which drift along the front and divide the surface into discrete facets. At higher velocities, facets give way to the formation of highly localized chains of microscopic cracks – micro-branches.
  I will show how crack fronts form these structures, and how, in turn, they affect crack front shape and dynamics, pointing to a new understanding of the toughness of brittle materials.
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