Interior Gap Superfluidity

W. Vincent Liu; Frank Wilczek

doi:10.1103/physrevlett.90.047002

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Interior Gap Superfluidity

W. Vincent Liu·Frank Wilczek

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Abstract

We propose a new state of matter in which the pairing interactions carve out a gap within the interior of a large Fermi ball, while the exterior surface remains gapless. This defines a system which contains both a superfluid and a normal Fermi liquid simultaneously, with both gapped and gapless quasiparticle excitations. This state can be realized at weak coupling. We predict that a cold mixture of two species of fermionic atoms with different mass will exhibit this state. For electrons in appropriate solids, it would define a material that is simultaneously superconducting and metallic.

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W. Vincent Liu, Frank Wilczek. 2002-08-02. Interior Gap Superfluidity. https://doi.org/10.1103/physrevlett.90.047002

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