Decay of hydrodynamic modes in dilute Bose-Einstein condensates

Erich D. Gust and L. E. Reichl
Phys. Rev. A 90, 043615 – Published 15 October 2014

Abstract

Expressions for the speed and lifetimes of the sound modes in a dilute Bose-Einstein condensate are obtained using Bogoliubov mean field theory. The condensate has two pairs of sound modes which undergo an avoided crossing as the equilibrium temperature is varied. The two pairs of sound modes decay at very different rates, except in the neighborhood of the avoided crossing, where the identity of the longest-lived mode switches. The predicted speed and lifetime of the longest-lived sound mode are consistent with recent experimental observations on sound in an Rb87 Bose-Einstein condensate.

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  • Received 15 May 2014

DOI:https://doi.org/10.1103/PhysRevA.90.043615

©2014 American Physical Society

Authors & Affiliations

Erich D. Gust* and L. E. Reichl

  • The Center for Complex Quantum Systems, The University of Texas at Austin, Austin, Texas 78712, USA

  • *egust@physics.utexas.edu
  • reichl@mail.utexas.edu

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Vol. 90, Iss. 4 — October 2014

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