Hubbard model with orbital degeneracy and integer or noninteger filling

Details Hubbard model with orbital degeneracy and integer or noninteger filling Hubbard model with orbital degeneracy and integer or noninteger filling

1997-05-28

arxiv.org/abs/cond-mat/9705284v1

Z. Phys. B 104, 279 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

11 pages, revtex, 14 eps figures, Z. Physik B (to be publ.), additional material avalable at http://librix.mpi-stuttgart.mpg

Scientific paper

10.1007/s002570050450

The photoemission spectrum and the specific heat are studied in the Hubbard model of small clusters including orbital degeneracy. We focus on the degeneracy and valence dependence in the limit of a large Coulomb interaction. For integer valence, it is found that the degeneracy increases the width of the photoemission spectrum and it reduces the contribution from the charge degrees of freedom to the specific heat. A deviation from integer valence reduces the width of the photoemission spectrum.

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