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SINGLE-PARTICLE EXCITATIONS IN THE NORMAL-STATE OF THE NEGATIVE-U HUBBARD-MODEL

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UNSPECIFIED (1994) SINGLE-PARTICLE EXCITATIONS IN THE NORMAL-STATE OF THE NEGATIVE-U HUBBARD-MODEL. JOURNAL OF PHYSICS-CONDENSED MATTER, 6 (30). pp. 5839-5858.

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Abstract

One-particle properties of the normal state of a negative-U Hubbard model are analysed within the framework of the incoherent local-pair (ILP) approach. In the self-consistent Hartree-Fock approximation an analytic expression for the critical value U(c) < 0 of the coupling strength is obtained below which the system becomes unstable towards the formation of incoherent local pairs. The single-particle excitation spectrum for different regimes of the attraction strength U and particle concentration n is investigated, and the U-n phase diagram is discussed.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Journal or Publication Title: JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher: IOP PUBLISHING LTD
ISSN: 0953-8984
Official Date: 25 July 1994
Dates:
DateEvent
25 July 1994UNSPECIFIED
Volume: 6
Number: 30
Number of Pages: 20
Page Range: pp. 5839-5858
Publication Status: Published

Data sourced from Thomson Reuters' Web of Knowledge

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