Superfluidity versus Anderson localization in a dilute Bose gas

T. Paul 1, P. Schlagheck 2, P. Leboeuf 1, N. Pavloff 1

Physical Review Letters 98 (2007) 210602

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, 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.

  • 1. Laboratoire de Physique Théorique et Modèles Statistiques (LPTMS),
    CNRS : UMR8626 – Université Paris XI - Paris Sud
  • 2. Institut für Theoretische Physik,
    Universitat Regensburg