Stable gapless superconductivity at strong coupling

Details Stable gapless superconductivity at strong coupling Stable gapless superconductivity at strong coupling

2006-02-07

arxiv.org/abs/hep-ph/0602065v1

Phys.Lett. B637 (2006) 367-373

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 4 figures

Scientific paper

10.1016/j.physletb.2006.04.054

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 and thus are stable. This is in contrast to the weak-coupling case where there are always two gapless nodes and the phase becomes magnetically unstable.

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