Phys. Rev. A 67, 053603 (2003) [5 pages]Superfluidity in the interior-gap statesReceived 31 December 2002; published 20 May 2003 We investigate superfluidity in the interior-gap states proposed by Liu and Wilczek. At weak coupling, we find the gapless interior-gap state unstable in physically accessible regimes of the parameter space, where the superfluid density is shown to be always negative. We therefore conclude that the spatially uniform interior-gap phase is extremely unstable unless it is fully gapped; in this case, however, the state is rather similar to conventional BCS states. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevA.67.053603
DOI:
10.1103/PhysRevA.67.053603
PACS:
03.75.Kk, 05.30.Fk, 67.90.+z, 74.20.-z
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