$XXZ$ model as effective Hamiltonian for generalized Hubbard models with broken $\eta$-symmetry
Condensed Matter
2009-10-22 v2 High Energy Physics - Theory
Exactly Solvable and Integrable Systems
solv-int
Abstract
We consider the limit of strong Coulomb attraction for generalized Hubbard models with -symmetry. In this limit these models are equivalent to the ferromagnetic spin-1/2 Heisenberg quantum spin chain. In order to study the behaviour of the superconducting phase in the electronic model under perturbations which break the -symmetry we investigate the ground state of the ferromagnetic non-critical -chain in the sector with fixed magnetization. It turns out to be a large bound state of magnons. We find that the perturbations considered here lead to the disappearance of the off-diagonal longe-range order.
Keywords
Cite
@article{arxiv.cond-mat/9411051,
title = {$XXZ$ model as effective Hamiltonian for generalized Hubbard models with broken $\eta$-symmetry},
author = {G. Albertini and V. E. Korepin and A. Schadschneider},
journal= {arXiv preprint arXiv:cond-mat/9411051},
year = {2009}
}
Comments
Results of previous version are generalized, new title, references added. 10 pages, Latex, no figures