Gapless Surfaces in Anisotropic Superfluids

Details Gapless Surfaces in Anisotropic Superfluids Gapless Surfaces in Anisotropic Superfluids

2004-11-09

arxiv.org/abs/cond-mat/0411238v2

Phys.Rev. B74 (2006) 184516

Physics

Condensed Matter

Superconductivity

14 pages, 4 figures; v2: edited for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.74.184516

We demonstrate when p-wave pairing occurs between species whose free Fermi surfaces are mismatched the gap generally vanishes over a two-dimensional surface. We present detailed calculations of condensation energy, superfluid density (Meissner mass) and specific heat for such states. We also consider stability against separation into mixed phases. According to several independent criteria that can be checked at weak coupling, the resulting ``breached'' state appears to be stable over a substantial range of parameters. The simple models we consider are homogeneous in position space, and break rotation symmetry spontaneously. They should be realizable in cold atom systems.

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