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

Abstract

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.

arXiv comment8 pages, RevTeX4

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• Inelastic neutron scattering study and Hubbard model description of the antiferromagnetic tetrahedral molecule Ni4Mo12
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• Ground state phase diagram and magnetoconductance of a one-dimensional Hubbard superlattice at half-filling
• Momentum-Resolved Fingerprint of Mottness in Layer-Dimerized Nb${}_3$Br${}_8$