Rigorous results on superconducting ground states for attractive extended Hubbard models

Details Rigorous results on superconducting ground states for attractive extended Hubbard models Rigorous results on superconducting ground states for attractive extended Hubbard models

1995-02-06

arxiv.org/abs/cond-mat/9502027v1

Physics

Condensed Matter

12 pages

Scientific paper

10.1103/PhysRevB.53.5153

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 "eta-paired" state for any non-vanishing 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.

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