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Kilian Müller

Collège de France (Paris)

Friday, June 17th, 2016 at 11:30:00 AM

AULA : Querzoli, LENS

Published on-line at 09:03:49 AM on Monday, June 13th, 2016

Suppression and Revival of Weak Localization through Control of Time-Reversal Symmetry

The study of coherent wave propagation in disordered media has been ongoing for several decades. Different experimental systems have been tested, each with its

The study of coherent wave propagation in disordered media has been ongoing for several decades. Different experimental systems have been tested, each with its own unique characteristics:electromagnetic, acoustic, matter, and seismic waves. Our group uses ultracold atoms, a relatively recent addition to the mix.
Over the last years we were able to observe Anderson Localisation (in 1D and 3D) and Coherent Backscattering. The latter is a first manifestation, as well as a telltale sign of coherent transport in disordered media. It depends on the time reversal symmetry (or, more precisely, the reciprocity) of wave propagation in the disordered medium.
I will present an experiment, where we exploited the precise control in time available in ultracold atom systems, to deliberately and precisely break this symmetry. We observed the destruction, followed by a short revival of the Coherent Backscattering signal when time reversal symmetry is briefly reestablished. In future experiments, this scheme could be extended to investigate higher order localisation processes at the heart of Anderson localization.

For further informations, please contact Lorenzo Pattelli.