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Physica C Superconductivity

Superconducting properties of a gas of fermions in 2 and 3 dimensions

E. Yépez, A. Calles, A. Cabrera, J.J. Castro, A. Salcido

Published Dec 1, 1989• 0 citations
Publisher
DOI
10.1016/0921-4534(89)90790-9

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We consider a gas of two species of fermions with population imbalance. Using the renormalization group in d=1+ϵ spatial dimensions, we show that for spinless fermions and 2>ϵ>0 a fixed point appears at finite attractive coupling where the quasiparticle residue vanishes, and identify this with the transition to Larkin-Ovchinnikov-Fulde-Ferrell order (inhomogeneous superconductivity). When the two species of fermions also carry spin degrees of freedom we find a fixed point indicating a transition to spin density wave order.