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

Authors
  • Keller, M
  • Metzner, W
  • Schollwöck, U
Type
Published Article
Journal
Physical review letters
Publication Date
May 14, 2001
Volume
86
Issue
20
Pages
4612–4615
Identifiers
PMID: 11384296
Source
Medline
License
Unknown

Abstract

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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