Nonlinear Seminar

Nonlinear Physics Seminar:"Hyperuniformity in driven suspensions of asymmetric particles"

Location: 
Danciger B building, Seminar room
Wed, 18/12/2019 - 12:00 to 13:00

Lecturer:Prof. Haim Diamant from Tel Aviv University
Abstract:
An arrangement of particles is said to be "hyperuniform" if its density
fluctuations over large distances are strongly suppressed relative to a
random configuration. Crystals, for example, are hyperuniform. Recently,
several disordered materials have been found to be hyperuniform. Examples
are sheared suspensions and emulsions, and random close packings of hard
spheres. We show that externally driven asymmetric particles in a liquid

Nonlinear Physics Seminar:"New directions for diffusive processes: defect formation through a nonequilibrium phase transition, open quantum systems and uncertainty relations in mesoscopic systems"

Location: 
Danciger B building, Seminar room
Wed, 04/12/2019 - 12:00 to 13:00

Lecturer: Dr. Ohad Shpielberg, College de France.
Abstract:
The macroscopic fluctuation theory gives an efficient hydrodynamic description for classical nonequilibrium diffusive systems. In this talk, we would cover how it can be applied and generalised in three unexplored directions:
a. Towards a theory for open quantum diffusive systems, comparable to the macroscopic fluctuation theory.

Nonlinear Physics Seminar:"Classical to quantum transition in chirped-driven Bose-Einstein condensates"

Location: 
Danciger B building, Seminar room
Wed, 30/10/2019 - 12:00 to 13:30

Lecturer: Lazar Friedland
Abstract:
This talk will describe the transition from classical evolution to quantum ladder climbing in chirped-driven dynamical problems of increasing complexity. The starting point will be the autoresonant pendulum, followed by its quantum mechanical analog and, finally, the associated driven BEC problem in an anharmonic trap.

Nonlinear Physics Seminar:"Universality of the band-gap density - from periodic graphs to laminates"

Location: 
Danciger B building, Seminar room
Wed, 05/06/2019 - 12:00 to 13:30

Lecturer: Prof. Rami Band from the Technion
Abstract:
The spectrum of periodic objects has a band-gap structure.
We show that such spectrum can be described in terms of a linear flow on a torus.
This characterization is valid for various periodic structures, such as quantum graphs and electroelastic laminates.
Using this approach allows to prove universal properties of the band-gap density and provides estimates on gap widths and other spectral statistics.
The talk is based on joint works with Gregory Berkolaiko and Gal Shmuel.

Nonlinear Physics Seminar:"Narrow escape and occupation statistics of interacting diffusing particles"

Location: 
Danciger B building, Seminar room
Wed, 19/06/2019 - 12:00 to 13:30

Lecturer: Tal Agranov
Abstract:
Fluctuations far from equilibrium are ubiquitous in nature, yet their theory is still in infancy.
A significant progress in understanding such fluctuations has been made possible with the recent appearance of the Macroscopic Fluctuation Theory (MFT) [1], which describes transport properties of ensembles of interacting diffusing particles.