TY - JOUR
T1 - Stable gapless superconductivity at strong coupling
AU - Kitazawa, Masakiyo
AU - Rischke, Dirk H.
AU - Shovkovy, Igor A.
N1 - Funding Information:
M.K. thanks T. Kunihiro for encouragements. I.A.S. acknowledges discussions with Andreas Schmitt. The work of M.K. was supported by Japan Society for the Promotion of Science for Young Scientists. The work of D.H.R. and I.A.S. was supported in part by the Virtual Institute of the Helmholtz Association under grant No. VH-VI-041, by the Gesellschaft für Schwerionenforschung (GSI), and by the Deutsche Forschungsgemeinschaft (DFG).
PY - 2006/6/22
Y1 - 2006/6/22
N2 - 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.
AB - 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.
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U2 - 10.1016/j.physletb.2006.04.054
DO - 10.1016/j.physletb.2006.04.054
M3 - Article
AN - SCOPUS:33646902712
SN - 0370-2693
VL - 637
SP - 367
EP - 373
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 6
ER -