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.

minor revisions, published in Phys. Rev. B

References in corpus (5)

• Interplay of Mott Transition and Ferromagnetism in the Orbitally Degenerate Hubbard Model
• A Simple Treatment of Metal-Insulator Transition: Effects of Degeneracy, Temperature and Applied Magnetic Field
• Slave-Boson Mean-Field Theory of the Antiferromagnetic State in the Doubly Degenerate Hubbard Model - the Half-Filled Case -
• Superconductivity in the Hubbard model with correlated hopping: Slave-boson study
• Metal-Insulator Transition in a Generalized Hubbard Model with Correlated Hopping at Half-Filling

Cited by in corpus (7)

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• Ground state ferromagnetism in a doubly orbitally degenerate model
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• Resonant enhancement of thermoelectric properties by correlated hopping for the Falicov-Kimball model on Bethe lattice
• 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