Symmetries of an Extended Hubbard Model

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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.
plain tex, 7 pages

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Condensed Matter, High Energy Physics - Theory, Quantum Algebra

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http://salesiana.dossiersoluciones.com/handle/123456789/151587

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9605121
 http://arxiv.org/abs/cond-mat/9605121

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arXiv