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Functional renormalization group approach to conventional theory of superfluidity and beyond

Fermionic functional renormalization group (FRG) is applied to describe the superfluid phase transition of the two-component fermionic system with attractive contact interaction. Connection between the fermionic FRG approach and the Bardeen-Cooper-Schrieffer (BCS) theory with its Gorkov and Melik-Barkhudarov (GMB) correction is made clear, and the FRG flow of the fermion self-energy is also studied to go beyond the BCS+GMB theory. The superfluid transition temperature and the associated chemical potential are calculated in the region of the negative scattering length using fermionic FRG.

preprint2014arXivOpen access
Yuya TanizakiGergely FejősTetsuo Hatsuda
cond-mat.supr-conhep-phnucl-thcond-mat.quant-gas
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Yuya TanizakiGergely FejősTetsuo Hatsuda

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