Attractive Hubbard model and single-particle pseudogap caused by classical pairing fluctuations in two-dimensions
| Titre | Attractive Hubbard model and single-particle pseudogap caused by classical pairing fluctuations in two-dimensions |
| Type de publication | Journal Article |
| Nouvelles publications | 1998 |
| Auteurs | Vilk YM, Allen S, Touchette H, Moukouri S, Chen L, Tremblay A-MS |
| Journal | Journal of Physics and Chemistry of Solids |
| Volume | 59 |
| Pagination | 1873–1875 |
| 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. |
