Symmetries of an Extended Hubbard Model
Condensed Matter
2008-02-03 v1 High Energy Physics - Theory
Quantum Algebra
q-alg
Abstract
An extended Hubbard model with phonons is considered on a D-dimensional lattice. The symmetries of the model are studied in various cases. It is shown that for a certain choice of the parameters a superconducting SU_q(2) holds as a true quantum symmetry - but only for D=1. In a natural basis the symmetry requires vanishing local phonon coupling; a quantum symmetric Hubbard model without phonons can then be obtained by a mean field approximation.
Cite
@article{arxiv.cond-mat/9605121,
title = {Symmetries of an Extended Hubbard Model},
author = {Bianca L. Cerchiai and Peter Schupp},
journal= {arXiv preprint arXiv:cond-mat/9605121},
year = {2008}
}
Comments
plain tex, 7 pages