Metal-insulator transition in a doubly orbitally degenerate model with correlated hopping
Abstract
In the present paper we propose a doubly orbitally degenerate narrow-band model with correlated hopping. The peculiarity of the model is taking into account the matrix element of electron-electron interaction which describes intersite hoppings of electrons. In particular, this leads to the concentration dependence of the effective hopping integral. The cases of the strong and weak Hund's coupling are considered. By means of a generalized mean-field approximation the single-particle Green function and quasiparticle energy spectrum are calculated. Metal-insulator transition is studied in the model at different integer values of the electron concentration. With the help of the obtained energy spectrum we find energy gap width and criteria of metal-insulator transition.
Keywords
Cite
@article{arxiv.cond-mat/9907037,
title = {Metal-insulator transition in a doubly orbitally degenerate model with correlated hopping},
author = {L. Didukh and Yu. Skorenkyy and Yu. Dovhopyaty and V. Hankevych},
journal= {arXiv preprint arXiv:cond-mat/9907037},
year = {2009}
}
Comments
minor revisions, published in Phys. Rev. B