Attractive Hubbard model and single-particle pseudogap caused by classical pairing fluctuations in two-dimensions

TitreAttractive Hubbard model and single-particle pseudogap caused by classical pairing fluctuations in two-dimensions
Type de publicationJournal Article
Nouvelles publications1998
AuteursVilk, YM, Allen, S, Touchette, H, Moukouri, S, Chen, L, Tremblay, A-MS
JournalJournal of Physics and Chemistry of Solids
Volume59
Pagination1873–1875
Résumé

It is shown that in the two-dimensional attractive Hubbard model, the mean-field phase transition is replaced by a renormalized classical regime of fluctuations where a pseudogap opens up in the single-particle spectral weight. It is argued that this pseudogap and precursors of the ordered state quasiparticles can occur only in strongly anisotropic quasi-two-dimensional materials. This precursor phenomenon differs from preformed local pairs. Further, while critical antiferromagnetic fluctuations would also lead to a pseudogap in the repulsive model, there are some important differences with thr superconducting case. (C) 1998 Elsevier Science Ltd. All rights reserved.

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