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Article overview
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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 | Abstract: | The 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 | Services: | Forum | Review | PDF | Favorites |
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