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Eur. Phys. J. B 7, 37-51
Spectral properties of the attractive Hubbard model
J.M. Singer - T. Schneider - P.F. Meier
Physikinstitut, Universität Zürich, Winterthurerstrasse 190, 8057 Zürich,
Switzerland
jms@physik.unizh.ch
Received: 7 July 1998 / Accepted: 30 July 1998
Abstract
We calculate the spectral functions, the band structure and the density of states of the 2D attractive Hubbard model
in the intermediate coupling regime (i.e. the crossover regime between BCS theory and
Bose-Einstein Condensation)
using a grand canonical quantum Monte-Carlo approach and a maximum entropy
procedure. The evolution of the spectral properties as a function of temperature is discussed. In particular,
on lowering the temperature, we find a splitting of the single band present at high temperatures
into several distinct branches, the number of which depends on the temperature.
PACS
74.20.-z Theories and models of superconducting state -
74.25.Dw Superconductivity phase diagrams - 71.10.Fd Lattice Fermion models (Hubbard model, etc.)
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Copyright EDP Sciences, Società Italiana di Fisica, Springer-Verlag