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.

arXiv commentminor revisions, published in Phys. Rev. B

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• Electron-hole asymmetry in electron systems with orbital degeneracy and correlated hopping
• Nonlocal correlations in the optical conductivity spectra
• Thermoelectric properties of Mott insulator with correlated hopping at microdoping