Superfluid density of an open dissipative condensate

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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.
Original languageEnglish
Article number080402
Number of pages5
JournalPhysical Review Letters
Issue number8
Publication statusPublished - 16 Aug 2011


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