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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.57: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Phase-coherent quantum propagation in disordered media — •Valentin V. Volchkov¹, Fred Jendrzejewski^1,3, Kilian Müller¹, Jeremie Richard¹, Philippe Bouyer², Alain Aspect¹, and Vincent Josse¹ — ¹Laboratoire Charles Fabry, Palaiseau, France — ²LP2N, Talence, France — ³Joint Quantum Institute, Gaithersburg, USA

Quantum interference effects play a fundamental role in our understanding of quantum propagation through disordered media, as it can lead to the suppression of transport, i.e. Anderson Localization. Recently it became possible to directly observe Anderson Localization with ultracold atoms[1]. For weak disorder, a first order manifestation of coherence is the phenomenon of coherent backscattering (CBS), i.e. the enhancement of the scattering probability in the backward direction, due to a quantum interference of amplitudes associated with two counter propagating multiple scattering paths.

Such a CBS peak can be directly observed by launching atoms with a well-defined momentum into a laser speckle disordered potential[2]. We study the dynamics of the CBS peak during the diffusion as a function of disorder strength.