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

Abstract

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 $T_C$.

2 pages, one major typo corrected, one reference added

References in corpus (1)

• Superconducting properties of the attractive Hubbard model

Cited by in corpus (6)

• Phase Fluctuations and Pseudogap Phenomena
• Pseudogap and spectral function from superconducting fluctuations to the bosonic limit
• Pairing fluctuations and pseudogaps in the attractive Hubbard model
• Phase Fluctuations and Single Fermion Spectral Density in 2D Systems with Attraction
• Spectral properties and pseudogaps in a model with d-wave pairing symmetry
• Quantum Phase Fluctuations Responsible for Pseudogap