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07 February 2025
 
  » arxiv » 1609.0240

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Interplay of the pseudogap and the BCS gap for heteropairs in $^{40}$K-$^6$Li mixture
P. Lipavský ; C. Berthod ;
Date 1 Sep 2016
AbstractThe description of heteropairs like $^{40}$K-$^6$Li near and in the superconducting state requires a fully selfconsistent theory [see Hanai and Ohashi, Phys. Rev. A 90, 043622 (2014)]. We derive analytic pseudogap Green’s functions for the ’normal’ and superconducting states from the fully selfconsistent T-matrix theory. The selfconsistency has two pronounced effects on the single-particle spectrum. First, the single-particle excitations decay before the asymptotic quasiparticle propagation is established, therefore the normal state is not a Fermi liquid. Second, the pseudogap has a V shape even for s-wave pairing. The V-shaped pseudogap and the U-shaped BCS gap interfere resulting in slope breaks of the gap walls and the in-gap states in the density of states. Various consequences of an incomplete selfconsistency are demonstrated.
Source arXiv, 1609.0240
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