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Critical Velocity of a Superfluid Bose Gas Flowing in a Random Potential

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Abstract

We investigate the critical velocity of a weakly interacting Bose gas flowing in a random potential. By applying the Bogoliubov theory to a disordered Bose system with a steady flow, we determine the critical velocity for weak and moderate disorder. We also calculate the superfluid density and the condensate density as a function of the disorder strength and the flow velocity, and their behaviors near the critical velocity are discussed.

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Acknowledgments

The author thanks Michikazu Kobayashi for fruitful discussions. The present study was supported by a Grant-in-Aid for JSPS Fellows (No. 15J01614).

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Authors and Affiliations

  1. Department of Physics, Kyoto University, Kyoto, 606-8502, Japan

    Taiki Haga

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  1. Taiki Haga
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Correspondence to Taiki Haga.

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Haga, T. Critical Velocity of a Superfluid Bose Gas Flowing in a Random Potential. J Low Temp Phys 183, 136–143 (2016). https://doi.org/10.1007/s10909-016-1527-7

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  • DOI: https://doi.org/10.1007/s10909-016-1527-7

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