Interior Gap Superfluidity

W. Vincent Liu, Frank Wilczek

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


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. The universality class of 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.

Original languageEnglish (US)
Pages (from-to)4
Number of pages1
JournalPhysical Review Letters
Issue number4
StatePublished - 2003
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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