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

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

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 alternatin...

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Veröffentlicht in:arXiv.org 2008-01
Hauptverfasser: Menteshashvili, M, Chachava, N, Japaridze, G I
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description 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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