Pseudogap in the one-electron spectral functions of the attractive Hubbard model

We calculate the one-electron Green's function of the two-dimensional (2D) attractive Hubbard model by coupling the electrons to pair fluctuations. The latter are approximated by homogeneous amplitude fluctuations and phase correlations corresponding to the XY-model. The electronic density of s...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1999, Vol.259, p.501-503
Main Authors: Capezzali, Massimiliano, Beck, Hans
Format: Article
Language:English
Subjects:
Hubbard model
Phase fluctuations
Pseudogap
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Summary:We calculate the one-electron Green's function of the two-dimensional (2D) attractive Hubbard model by coupling the electrons to pair fluctuations. The latter are approximated by homogeneous amplitude fluctuations and phase correlations corresponding to the XY-model. The electronic density of states shows a pseudogap at temperatures well above the transition temperature T c. For a quasi-3D system, a superconducting gap emerges out of the pseudogap below T c.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(98)00748-0