Stable gapless superconductivity at strong coupling

Abstract

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.

8 pages, 4 figures

References in corpus (4)

• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Two lectures on color superconductivity
• Chromomagnetic instability in dense quark matter
• Fermi surfaces and Luttinger's theorem in paired fermion systems

Cited by in corpus (11)

• Color superconductivity in dense quark matter
• BEC-BCS Crossover in the Nambu--Jona-Lasinio Model of QCD
• Pion Condensation in Baryonic Matter: from Sarma Phase to Larkin-Ovchinnikov-Fudde-Ferrell Phase
• BCS/BEC crossover in Quark Matter and Evolution of its Static and Dynamic properties
• Relativistic BCS-BEC crossover in a boson-fermion model
• Stability conditions and Fermi surface topologies in a superconductor
• Vector interaction, charge neutrality and multiple chiral critical point structures
• Evaluating the phase diagram of superconductors with asymmetric spin populations
• Fermion Cooper Pairing with Unequal Masses: Standard Field Theory Approach
• Phase space and quark mass effects in neutrino emissions in a color superconductor
• Magnetic Stability Analysis for Abelian and Non-Abelian Superconductors