Fizika Nizkikh Temperatur: Volume 43, Number 11 (November 2017), p. 1622-1625    ( to contents , go back )

Validity of t–J approximation for extended Hubbard model with strong repulsion

V.O. Cheranovskii1, D.J. Klein2, E.V. Ezerskaya1, and V.V. Tokarev1

1V.N. Karazin Kharkiv National University, 4 Svoboda Sq., Kharkiv 61022, Ukraine
E-mail: cheranovskii@i.ua

2Texas A&M University at Galveston, Galveston, TX, 77554 USA

Received June 1, 2017

Abstract

It is shown that for finite cyclic systems described by two band Hubbard Hamiltonian with strong electron repulsion the reduction to effective t–J model may give incorrect description of the ground state symmetry due to neglect of the correlated hopping terms.

PACS: 75.10.Jm Quantized spin models, including quantum spin frustration;
PACS: 75.40.Сx Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.).

Key words: Hubbard model, t–J model, correlated hopping.

Published online: September 25, 2017

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