Critical velocity of flowing supersolids of dipolar Bose gases in optical lattices

Details Critical velocity of flowing supersolids of dipolar Bose gases in optical lattices Critical velocity of flowing supersolids of dipolar Bose gases in optical lattices

2010-02-20

arxiv.org/abs/1002.3925v2

Phys. Rev. A 82, 013645 (2010)

Physics

Condensed Matter

Quantum Gases

7 pages, 4 figures, published version

Scientific paper

We study superfluidity of supersolid phases of dipolar Bose gases in two-dimensional optical lattices. We perform linear stability analyses for the corresponding dipolar Bose-Hubbard model in the hardcore boson limit to show that a supersolid can have stable superflow until the flow velocity reaches a certain critical value. The critical velocity for the supersolid is found to be significantly smaller than that for a conventional superfluid phase. We propose that the critical velocity can be used as a signature to identify the superfluidity of the supersolid phase in experiment.

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