Rotons in gaseous Bose-Einstein condensates irradiated by a laser

Abstract

A gaseous Bose-Einstein condensate (BEC) irradiated by a far off-resonance laser has long-range interatomic correlations caused by laser-induced dipole-dipole interactions. These correlations, which are tunable via the laser intensity and frequency, can produce a `roton' minimum in the excitation spectrum--behavior reminiscent of the strongly correlated superfluid liquid helium II.

arXiv comment6 pages, includes 3 figures

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• Exact hydrodynamics of a trapped dipolar Bose-Einstein condensate
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• Experimental observation of one-dimensional superradiance lattices in ultracold atoms
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