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arxiv: cond-mat/9701151 · v1 · submitted 1997-01-21 · ❄️ cond-mat.str-el

Mott-Hubbard insulators for systems with orbital degeneracy

Olle Gunnarsson(1) , Erik Koch(2) , Richard M. Martin(2) ((1) Max-Planck-Institut f\"ur Festk\"orperforschung , Stuttgart , Germany , (2) Department of Physics , University of Illinios , Urbana) This is my paper
classification ❄️ cond-mat.str-el
keywords banddegeneracyhoppinglargemott-hubbardorbitalbehaviorcertain
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We study how the electron hopping reduces the Mott-Hubbard band gap in the limit of a large Coulomb interaction U and as a function of the orbital degeneracy N. The results support the conclusion that the hopping contribution grows as roughly \sqrt{N}W, where W is the one-particle band width, but in certain models a crossover to a \sim NW behavior is found for a sufficiently large N.

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