Physics – Condensed Matter – Superconductivity
Scientific paper
2008-05-30
Phys. Rev. B 79, 024511 (2009)
Physics
Condensed Matter
Superconductivity
V3: Version published in Physical Review B
Scientific paper
10.1103/PhysRevB.79.024511
We investigate fermionic superconductivity with mismatched Fermi surfaces in a general two-band system. The exchange interaction between the two bands changes significantly the stability structure of the pairing states. The Sarma state with two gapless Fermi surfaces which is always unstable in single-band systems, can be the stable ground state in two-band systems. To realize a visible mismatch window for the stable Sarma state, two conditions should be satisfied: a nonzero inter-band exchange interaction and a large asymmetry between the two bands.
He Lianyi
Zhuang Peng-fei
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