Effective Hamiltonian for a half-filled asymmetric ionic Hubbard chain with alternating on-site interaction

Grusha, I.; Menteshashvili, Mikheil; Japaridze, Giorgi I.

doi:10.1142/S0217979215502604

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Journal article

Effective Hamiltonian for a half-filled asymmetric ionic Hubbard chain with alternating on-site interaction

Grusha, I. Faculty of Natural Sciences and Engineering, Ilia State University, Tbilisi, Georgia
Menteshashvili, Mikheil Department of Physics, University of Fribourg, Switzerland
Japaridze, Giorgi I. Andronikashvili Institute of Physics, Tbilisi, Georgia

06.01.2016

Published in:

International Journal of Modern Physics B. - 2016, vol. 30, no. 3, p. 1550260

English We derive an effective spin Hamiltonian for the one-dimensional half-filled asymmetric ionic Hubbard model (IHM) with alternating on-site interaction in the limit of strong repulsion. It is shown that the effective Hamiltonian is that of a spin S = 1/2 anisotropic XXZ Heisenberg chain with alternating next-nearest-neighbor (NNN) and three-spin couplings in the presence of a uniform and a staggered magnetic field.

Faculty

Faculté des sciences et de médecine

Department

Département de Physique

Language