Dynamical mean-field theory for pairing and spin gap in the attractive hubbard model.
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.
Keller
M
M
Theoretische Physik C, Technische Hochschule Aachen, D-52056 Aachen, Germany.
Metzner
W
W
Schollwöck
U
U