Effective Hamiltonian for a Half-filled Hubbard Chain with Alternating On-site Interactions

Details Effective Hamiltonian for a Half-filled Hubbard Chain with Alternating On-site Interactions Effective Hamiltonian for a Half-filled Hubbard Chain with Alternating On-site Interactions

2004-05-04

arxiv.org/abs/cond-mat/0405048v1

J. Phys.: Condens. Matter 16, 5815 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, RevTeX4

Scientific paper

10.1088/0953-8984/16/32/017

We derive an effective spin Hamiltonian for the one-dimensional half-filled
Alternating Hubbard model in the limit of strong on-site repulsion. We show
that the effective Hamiltonian is a spin $S=1/2$ Heisenberg chain with
asymmetric next-nearest-neighbor (nnn) exchange.

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