Anisotropic dissipation of superfluid flow in a periodically-dressed Bose-Einstein condensate
arXiv:cond-mat/0211343 · doi:10.1088/1367-2630/5/1/350
Abstract
The introduction of a steady-state spatially-periodic Raman coupling between two components of an ultracold atomic gas produces a dressed-state gas with an anisotropic and tunable dispersion relation. A Bose-Einstein condensate formed in such a gas is consequently characterized by an anisotropic superfluid critical velocity. The anisotropic dissipation of superfluid flow is quantified by considering the scattering of impurities flowing through this superfluid. A gradual transition from the isotropic nature of an uncoupled Bose-Einstein condensate to the anisotropic periodically-dressed condensate is obtained as the strength of the Raman coupling is varied. These results present a clear signature for future experiemental realizations of this novel superfluid.
arXiv comment14 pages, 6 figures
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