Regensburg 2007 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 25: Quantum Liquids, Bose-Einstein Condensates, Ultracold Atoms, ...

TT 25.1: Talk

Thursday, March 29, 2007, 14:00–14:15, H18

From superfluidity to Anderson-localization in quasi 1d Bose-Einstein condensates. — •Tobias Paul, Patricio Leboeuf, and Nicolas Pavloff — Laboratoire de Physique Théorique et Modèles Statistiques, Universite Paris Sud, Batiment 100, F-91405 Orsay Cedex

The interplay between particle-particle interactions and disorder-induced interference effects is a challenging aspect of condensed matter physics, which is due to the advent of coherent atom manipulation nowadays revisited in guided Bose-Einstein condensates [1,2]. In this contribution we present a new, global analysis of the coherent condensate flow through a disordered region. We show that a variation of the condensate velocity v with respect to the disordered potential induces different regimes of quantum transport. We demonstrate the existence of three different regimes: At velocities v small compared to the sound velocity c the flow shows superfluid behaviour, whereas a domain of time dependent flow is reached when v becomes comparable to c. For velocities v considerably larger then the sound velocity again a stationary regime is found. In this domain, depending of the extent of the disordered region, the system enters an Anderson localized phase.

[1] D. Clement et al. Phys. Rev. Lett. 95, 170409 (2005)

[2] T. Schulte et al. Phys. Rev. Lett. 95, 170411 (2005)