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Phys Rev Lett. 2011 Aug 19;107(8):080402. Epub 2011 Aug 16.

Superfluid density of an open dissipative condensate.

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  • 1SUPA, School of Physics and Astronomy, University of St. Andrews, KY16 9SS, United Kingdom.

Abstract

I calculate the superfluid density of a nonequilibrium steady state condensate of particles with finite lifetime. Despite the absence of a simple Landau critical velocity, a superfluid response survives, but dissipation reduces the superfluid fraction. I also suggest an idea for how the superfluid density of an example of such a system, i.e., microcavity polaritons, might be measured.

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