Phys. Rev. Lett. 88, 090401 (2002) [4 pages]Periodically Dressed Bose-Einstein Condensate: A Superfluid with an Anisotropic and Variable Critical VelocityReceived 12 June 2001; published 12 February 2002 We consider a two-component atomic gas illumined by two intersecting laser beams which induce Raman coupling between the components. This spatially periodic coupling modifies the dispersion relation of the gas. Properties of a Bose-Einstein condensate of such a gas are strongly affected by this modification. Using the quasiparticle excitation spectrum derived from a Bogoliubov transformation, the Landau critical velocity is found to be anisotropic and can be widely tuned by varying properties of the dressing laser beams. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.88.090401
DOI:
10.1103/PhysRevLett.88.090401
PACS:
03.75.Fi, 05.30.Jp
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