Validity of t-J approximation for extended Hubbard model with strong repulsion
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V.O. Cheranovskii, D.J. Klein, E.V. Ezerskaya, and V.V. Tokarev, 2017. It is shown that for finite cyclic systems described by two band Hubbard Hamiltonian with strong electron re-pulsion the reduction to effective t-J model may give incorrect description of the ground state symmetry due to neglect of the correlated hopping terms.