Attractive Hubbard model and single-particle pseudogap due to classical pairing fluctuations in two dimensions
Abstract
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. Furthermore, while critical antiferromagnetic fluctuations would also lead to a pseudogap in the repulsive model, there are some important differences between the superconducting and magnetic pseudogap.
Keywords
Cite
@article{arxiv.cond-mat/9710013,
title = {Attractive Hubbard model and single-particle pseudogap due to classical pairing fluctuations in two dimensions},
author = {Y. M. Vilk and S. Allen and H. Touchette and S. Moukouri and L. Chen and A. -M. S. Tremblay},
journal= {arXiv preprint arXiv:cond-mat/9710013},
year = {2009}
}
Comments
As published (corrected misprints and Fig.2), 3 pages, Latex, 2 epsf figures included. Proceedings SNS-97