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cond-mat.str-el2009
Variational ground states of the two-dimensional Hubbard model
D. Baeriswyl, D. Eichenberger, M. Menteshashvili
Recent refinements of analytical and numerical methods have improved our understanding of the ground-state phase diagram of the two-dimensional (2D) Hubbard model. Here we focus on…
cond-mat.str-el2008
Effective Hamiltonian for a half-filled tetramerized ionic-Hubbard chain
M. Menteshashvili, N. Chachava, G. I. Japaridze
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 Ha…