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Energy spectrum of a doubly orbitally degenerate model with non-equivalent subbands
In the present paper we investigate a doubly orbitally degenerate narrowband model with correlated hopping. The model peculiarity takes into account the matrix element of electron-electron interaction which describes intersite hoppings of electrons. In particular, this leads to the concentration...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Інститут фізики конденсованих систем НАН України
2001
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| Series: | Condensed Matter Physics |
| Online Access: | http://dspace.nbuv.gov.ua/handle/123456789/120472 |
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| Summary: | In the present paper we investigate a doubly orbitally degenerate narrowband
model with correlated hopping. The model peculiarity takes 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. Using the
obtained energy spectrum we find criteria of metal-insulator transition. |
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