Effect of quasiparticle renormalization on the localization of the excitations of a one-dimensional Bose-Einstein condensate in a random potential


AVGIN İ. , Huber D. L.

PHYSICA B-CONDENSED MATTER, vol.406, no.10, pp.1906-1908, 2011 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 406 Issue: 10
  • Publication Date: 2011
  • Doi Number: 10.1016/j.physb.2011.02.052
  • Title of Journal : PHYSICA B-CONDENSED MATTER
  • Page Numbers: pp.1906-1908

Abstract

We investigate the effects of renormalization on the localization of the quasiparticle excitations of one-dimensional Bose-Einstein condensate in a random potential. Starting with a set of linearized equations of motion for the phases of superfluid grains coupled by Josephson interactions, we use mode-counting techniques to calculate the inverse localization length for large (10(8)) arrays. Employing distributions for the interaction parameters that are the same as the initial (pre-renormalization) distributions used by Gurarie et al. (Phys. Rev. Lett. 101 (2008) 170407), we compare the initial-interaction results for the localization length with those obtained using renormalization group techniques. (C) 2011 Elsevier B.V. All rights reserved.