Superfluidity in the interior-gap states

Details Superfluidity in the interior-gap states Superfluidity in the interior-gap states

2003-03-11

arxiv.org/abs/cond-mat/0303185v1

Physical Review A {\bf 67} 053603 (2003)

Physics

Condensed Matter

To appear in Physical Review A

Scientific paper

10.1103/PhysRevA.67.053603

We investigate superfluidity in the interior-gap states proposed by Liu and Wilczek. At weak coupling, we find the {\em 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.

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