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

Y. M. Vilk; S. Allen; H. Touchette; S. Moukouri; L. Chen; A. M.S. Tremblay

doi:10.1016/S0022-3697(98)00129-2

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

Y. M. Vilk, S. Allen, H. Touchette, S. Moukouri, L. Chen, A. M.S. Tremblay

Research output: Contribution to journal › Article › peer-review

16 Scopus citations

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. Further, while critical antiferromagnetic fluctuations would also lead to a pseudogap in the repulsive model, there are some important differences with the superconducting case.

Original language	English
Pages (from-to)	1873-1875
Number of pages	3
Journal	Journal of Physics and Chemistry of Solids
Volume	59
Issue number	10-12
DOIs	https://doi.org/10.1016/S0022-3697(98)00129-2
State	Published - 1 Jan 1998
Externally published	Yes

Keywords

Fluctuations
Hubbard model
Quasiparticles
Single-particle pseudogap

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

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10.1016/S0022-3697(98)00129-2

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title = "Attractive Hubbard model and single-particle pseudogap caused by 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. Further, while critical antiferromagnetic fluctuations would also lead to a pseudogap in the repulsive model, there are some important differences with the superconducting case.",

keywords = "Fluctuations, Hubbard model, Quasiparticles, Single-particle pseudogap",

author = "Vilk, {Y. M.} and S. Allen and H. Touchette and S. Moukouri and L. Chen and Tremblay, {A. M.S.}",

note = "Funding Information: We thank H.-G. Mattutis for discussion on Monte Carlo methods. We thank the Centre d'application du calcul parall{\`e}le de l'Universit{\'e} de Sherbrooke (CACPUS) for access to an IBM-SP2. This work was partially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Fonds pour la formation de chercheurs et l'aide {\`a} la recherche from the Government of Qu{\'e}bec (FCAR), and (for Y.M.V.) by the National Science Foundation (Grant No. NSF–DMR–91–20000) through the Science and Technology Center for Superconductivity and (for A.-M.S.T.) by the Canadian Institute for Advanced Research (CIAR).",

year = "1998",

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doi = "10.1016/S0022-3697(98)00129-2",

language = "English",

volume = "59",

pages = "1873--1875",

journal = "Journal of Physics and Chemistry of Solids",

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TY - JOUR

T1 - Attractive Hubbard model and single-particle pseudogap caused by classical pairing fluctuations in two-dimensions

AU - Vilk, Y. M.

AU - Allen, S.

AU - Touchette, H.

AU - Moukouri, S.

AU - Chen, L.

AU - Tremblay, A. M.S.

N1 - Funding Information: We thank H.-G. Mattutis for discussion on Monte Carlo methods. We thank the Centre d'application du calcul parallèle de l'Université de Sherbrooke (CACPUS) for access to an IBM-SP2. This work was partially supported by the Natural Sciences and Engineering Research Council of Canada (NSERC), the Fonds pour la formation de chercheurs et l'aide à la recherche from the Government of Québec (FCAR), and (for Y.M.V.) by the National Science Foundation (Grant No. NSF–DMR–91–20000) through the Science and Technology Center for Superconductivity and (for A.-M.S.T.) by the Canadian Institute for Advanced Research (CIAR).

PY - 1998/1/1

Y1 - 1998/1/1

N2 - 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 the superconducting case.

AB - 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 the superconducting case.

KW - Fluctuations

KW - Hubbard model

KW - Quasiparticles

KW - Single-particle pseudogap

UR - http://www.scopus.com/inward/record.url?scp=0032179475&partnerID=8YFLogxK

U2 - 10.1016/S0022-3697(98)00129-2

DO - 10.1016/S0022-3697(98)00129-2

M3 - Article

AN - SCOPUS:0032179475

SN - 0022-3697

VL - 59

SP - 1873

EP - 1875

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 10-12

ER -

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

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Keywords

ASJC Scopus subject areas

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