Nonlinear Seminar

Nonlinear Physics Seminar:"Two Universalities in Semiconductor Physics"

Location: 
Danciger B building, Seminar room
Wed, 26/02/2020 - 12:00 to 13:30

Lecturer: Prof. Michael Wilkinson from the Open University
Abstract:
I shall give theoretical explanations of
two experimental observations of universal
behaviour in semiconductor systems.
The fist concerns the dependence of
photoconductivity $G$ upon light intensity $I$.
It is typically found that $G=I^\gamma$. Simple kinetic
theory indicates that we should expect
$\gamma=1$ or $\gamma=1/2$, but experimentally
values close to $\gamma =3/4$ or $\gamma=2/3$
are often observed, with $I$ varying over several decades.

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.