Superfluidity in the interior-gap states
- 20 May 2003
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 67 (5) , 053603
- https://doi.org/10.1103/physreva.67.053603
Abstract
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.Keywords
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