Rigorous results on superconducting ground states for attractive extended Hubbard models
Condensed Matter
2009-10-28 v1
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 "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.
Keywords
Cite
@article{arxiv.cond-mat/9502027,
title = {Rigorous results on superconducting ground states for attractive extended Hubbard models},
author = {Arianna Montorsi and David K. Campbell},
journal= {arXiv preprint arXiv:cond-mat/9502027},
year = {2009}
}
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12 pages