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

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

2008-01-08

arxiv.org/abs/0801.1290v1

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, no figures or tables

Scientific paper

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.

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