1997/01/21 by O. Gunnarsson, Olle Gunnarsson, Erik Koch +1 · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.56.1146
published as Phys. Rev. B 56, 1146 (1997) · 7 pages, revtex, 6 figures more information at http://www.mpi-stuttgart.mpg.de/dokumente/andersen/fullerene/
arxiv created 1997/01/21 · openalex publication_date 1997/07/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 √(N)W, where W is the one-particle bandwidth, but in certain models a crossover to an \ensuremath∼NW behavior is found for sufficiently large N.