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Attractive Hubbard model and single-particle pseudogap due to classical pairing fluctuations in two dimensions | | Y.M. Vilk
; S. Allen
; H. Touchette
; S. Moukouri
; L. Chen
; A.-M.S. Tremblay
; | | Date: |
1 Oct 1997 | | Journal: | J. Phys. Chem. Solids 59, 1873-1875 (1998) | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | Affiliation: | Argonne), S. Allen, H. Touchette, S. Moukouri, L. Chen and A.-M.S. Tremblay (Sherbrooke | | 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. | | Source: | arXiv, cond-mat/9710013 | | Services: | Forum | Review | PDF | Favorites | |
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