Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 20, Pages 4612-4615Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.4612
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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 quasiparticle weight vanishes discontinuously at the transition between the two normal states.
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