Gapless Surfaces in Anisotropic Superfluids

Abstract

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.

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

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• Bogoliubov-Fermi Surfaces in Noncentrosymmetric Multicomponent Superconductors
• The Single Flavor Color Superconductivity in a Magnetic Field
• Electronic multipoles and multiplet pairs induced from Pomeranchuk and Cooper instabilities of Bogoliubov Fermi surfaces
• Odd-frequency pairing inherent in Bogoliubov Fermi liquid
• Bogoliubov-Fermi surface with inversion symmetry and electron-electron interactions: relativistic analogies and lattice theory
• Impurity effect on Bogoliubov Fermi surfaces: Analysis based on iron-based superconductors
• Analytical Results for Cold Asymmetrical Fermion Superfluids at the Mean-Field Level
• Anomalous Superfluid Density in Pair-Density-Wave Superconductors