Mott-Hubbard insulators for systems with orbital degeneracy
- 15 July 1997
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 56 (3) , 1146-1152
- https://doi.org/10.1103/physrevb.56.1146
Abstract
We study how the electron hopping reduces the Mott-Hubbard band gap in the limit of a large Coulomb interaction and as a function of the orbital degeneracy . The results support the conclusion that the hopping contribution grows as roughly , where is the one-particle bandwidth, but in certain models a crossover to an behavior is found for sufficiently large .
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