Dynamical mean-field theory for pairing and spin gap in the attractive Hubbard model

Details Dynamical mean-field theory for pairing and spin gap in the attractive Hubbard model Dynamical mean-field theory for pairing and spin gap in the attractive Hubbard model

2001-01-04

arxiv.org/abs/cond-mat/0101047v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.86.4612

We solve the attractive Hubbard model for arbitrary interaction strengths within dynamical mean-field theory. We compute the transition temperature for superconductivity and analyze electron pairing in the normal phase. The normal state is a Fermi liquid at weak coupling and a non-Fermi liquid state with a spin gap at strong coupling. Away from half-filling, the quasi-particle weight vanishes discontinuously at the transition between the two normal states.

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