Two-fluid model of a Bose-Einstein condensate in the cavity optomechanical regime

Details Two-fluid model of a Bose-Einstein condensate in the cavity optomechanical regime Two-fluid model of a Bose-Einstein condensate in the cavity optomechanical regime

2009-11-17

arxiv.org/abs/0911.3234v1

Physics

Condensed Matter

Quantum Gases

4 pages, 3 figures

Scientific paper

We analyze an atomic Bose-Einstein condensate trapped in a high-Q optical cavity driven by a feeble optical field, a situation formally analogous to the central paradigm of cavity optomechanics [Brennecke et al., Science, 322, 235 (2008)]. We account for two-body interactions via a two-fluid model that retains the intuitive appeal of the optomechanical two-mode description. The Bogoliubov excitation spectrum of this system comprises a gapped upper branch and a lower branch that can include an unstable excitation mode.

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