Effective Hamiltonian for a half-filled tetramerized ionic-Hubbard chain

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We derive an effective spin Hamiltonian for the one-dimensional half-filled tetramerized ionic-Hubbard model in the limit of strong on-site repulsion. We show that the effective Hamiltonian which describes the low-energy spin sector of the model is a spin S=1/2 Heisenberg Hamiltonian with alternating nearest-neighbour exchange.
8 pages, no figures or tables

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Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/145579

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0801.1290
 http://arxiv.org/abs/0801.1290

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arXiv