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Superfluidity versus Anderson localization in a dilute Bose gas
T Paul1, P Schlagheck, P Leboeuf
1Laboratoire de Physique Théorique et Modèles Statistiques, CNRS, Université Paris Sud, UMR8626, 91405 Orsay Cedex, France.
Abstract:
We consider the motion of a quasi-one-dimensional beam of Bose-Einstein condensed particles in a disordered region of finite extent. Interaction effects lead to the appearance of two distinct regions of stationary flow. One is subsonic and corresponds to superfluid motion. The other one is supersonic and dissipative and shows Anderson localization. We compute analytically the interaction-dependent localization length. We also explain the disappearance of the supersonic stationary flow for large disordered samples.
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