Behavior of the impurity atom in a weakly-interacting Bose gas

Abstract

We studied the properties of a single impurity atom immersed in a dilute Bose condensate at low temperatures. In particular, we perturbatively obtained the momentum dependence of the impurity spectrum and damping. By means of the Brillouin-Wigner perturbation theory we also calculated the self-energy both for attractive and repulsive polaron in the long-wavelength limit. The stability problem of the impurity atom in a weakly-interacting Bose gas is also examined.

11 pages, 4 figures

References in corpus (3)

• Variational study of polarons in Bose-Einstein condensates
• Self-localized impurities embedded in a one dimensional Bose-Einstein condensate and their quantum fluctuations
• The Bose polaron problem: effect of mass imbalance on binding energy