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Pseudogap in the one-electron spectral functions of the attractive Hubbard model
We calculate the one-electron Green's function of the 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 . For a
quasi-3D system, a superconducting gap emerges out of the pseudogap below
.Comment: 2 pages, one major typo corrected, one reference adde
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