Rigorous results on superconducting ground states for attractive extended Hubbard models

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.5153· OSTI ID:279077

Montorsi, A ^[1]; Campbell, D K ^[1]

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1. Department of Physics, University of Illinois at Urbana-Champaign, Illinois 61801 (United States)

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.}

• OSTI ID: 279077
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 9 Vol. 53; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
COULOMB FIELD
EXCHANGE INTERACTIONS
GROUND STATES
HIGH-TC SUPERCONDUCTORS
HUBBARD MODEL
SUPERCONDUCTIVITY