Pair fluctuation induced pseudogap in the normal phase of the two-dimensional attractive Hubbard model at weak coupling

Details Pair fluctuation induced pseudogap in the normal phase of the two-dimensional attractive Hubbard model at weak coupling Pair fluctuation induced pseudogap in the normal phase of the two-dimensional attractive Hubbard model at weak coupling

2000-11-29

arxiv.org/abs/cond-mat/0011500v2

Phys. Rev. B 63, 224509

Physics

Condensed Matter

Superconductivity

22 pages, 13 figures

Scientific paper

10.1103/PhysRevB.63.224509

One-particle spectral properties in the normal phase of the two-dimensional attractive Hubbard model are investigated in the weak coupling regime using the non-selfconsistent T-matrix approximation. The corresponding equations are evaluated numerically directly on the real frequency axis. For temperatures sufficiently close to the superconducting transition temperature a pseudogap in the one-particle spectral function is observed, which can be assigned to the increasing importance of pair fluctuations.

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