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Author Montorsi, A. ♦ Campbell, D. K.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ HUBBARD MODEL ♦ SUPERCONDUCTIVITY ♦ COULOMB FIELD ♦ EXCHANGE INTERACTIONS ♦ GROUND STATES ♦ HIGH-TC SUPERCONDUCTORS
Abstract We show that the exact ground state for a class of extended Hubbard models including bond-charge, exchange, and pair-hopping terms, is the Yang {open_quote}{open_quote}{eta}-paired{close_quote}{close_quote} state for any nonvanishing positive value of the pair-hopping amplitude, at least when the on-site Coulomb interaction is attractive enough and the remaining physical parameters satisfy a single constraint. The ground state is thus rigorously superconducting. Our result holds on a bipartite lattice in any dimension, at any band filling, and for arbitrary electron hopping. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-03-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 9


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