CHANGED TIME for Seminar on Thu, 1 Dec: 16:00!

[Mueller Markus]

This week's seminar on Disorder and strong electron correlations
by D. Delande (Thu Dec 1)
has to be postponed to the afternoon, 4pm.



CONDENSED MATTER AND STATISTICAL PHYSICS SECTION

SEMINAR on   Disorder and strong electron correlations

Thursday, 1 December-  16:00 p.m.
Luigi Stasi Seminar Room,  Leonardo Building - first floor

Dominique DELANDE     ( Universite' Pierre et Marie Curie, Paris )

"The atomic quasi-periodic kicked rotor: Experimental test of the
universality of the Anderson transition, critical behaviour and large
fluctuations"

Abstract
The quasi-periodic kicked rotor is a one-dimensional system displaying
the same metal-insulator Anderson transition than a usual 3D disordered
system.  This model can be experimentally realized using a cold atomic
gas, allowing for a direct measurement of the temporal dynamics.
Accurate measurements of the atomic wavefunction dynamics and the use of 
finite-size scaling techniques make it possible to measure with a good
precision the value of the critical exponent \nu and to test its
universality.  We also study the spatio-temporal evolution of the 
wavefunction at the critical point, and show that it is well described
at short times by self-consistent theory of localization.  At long times -
probably not accessible to the present generation of experiments - large
deviations are observed, related to the multifractal character of the
wavefunctions.