title: Dipole oscillations of a Bose-Einstein condensate in the presence of defects and disorder.
abstract: We consider dipole oscillations of a trapped dilute Bose-Einstein condensate in the presence of a scattering potential consisting either in a localized defect or in an extended disordered potential. In both cases the breaking of superfluidity and the damping of the oscillations are shown to be related to the appearance of a nonlinear dissipative flow. At supersonic velocities the flow becomes asymptotically dissipationless.
authors.affiliation: Laboratoire de Physique Théorique et Modèles Statistiques, CNRS, Université Paris Sud, UMR8626, 91405 Orsay Cedex, France.
authors.forename: M
authors.initials: M
authors.lastname: Albert
authors.forename: T
authors.initials: T
authors.lastname: Paul
authors.forename: N
authors.initials: N
authors.lastname: Pavloff
authors.forename: P
authors.initials: P
authors.lastname: Leboeuf