Stable gapless superconductivity at strong coupling

Masakiyo Kitazawa, Dirk H. Rischke, Igor A. Shovkovy

Research output: Contribution to journalArticlepeer-review

27 Scopus citations


We study cross-flavor Cooper pairing in a relativistic system of two fermion species with mismatched Fermi surfaces. We find that there exist gapless phases which are characterized by either one or two gapless nodes in the energy spectra of their quasiparticles. An analysis of the current-current correlator reveals that, at strong coupling, both of these gapless phases can be free of magnetic instabilities. This is in contrast to the weak-coupling case where there are always two gapless nodes and the phase becomes magnetically unstable.

Original languageEnglish (US)
Pages (from-to)367-373
Number of pages7
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Issue number6
StatePublished - Jun 22 2006
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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