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

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

1998-06-18

arxiv.org/abs/cond-mat/9806211v2

Physics

Condensed Matter

2 pages, one major typo corrected, one reference added

Scientific paper

10.1016/S0921-4526(98)00748-0

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 $T_{C}$. For a quasi-3D system, a superconducting gap emerges out of the pseudogap below $T_{C}$.

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