Metal-insulator transition in a doubly orbitally degenerate model with correlated hopping

Details Metal-insulator transition in a doubly orbitally degenerate model with correlated hopping Metal-insulator transition in a doubly orbitally degenerate model with correlated hopping

1999-07-02

arxiv.org/abs/cond-mat/9907037v2

Phys. Rev. B, vol.61, No.12, p.7893-7908 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

minor revisions, published in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.61.7893

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.

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