Orbital order in degenerate Hubbard models : A variational study

Details Orbital order in degenerate Hubbard models : A variational study Orbital order in degenerate Hubbard models : A variational study

2007-05-23

arxiv.org/abs/0705.3318v2

J. Phys.: Condens. Matter 19, 326217 (2007)

Physics

Condensed Matter

Strongly Correlated Electrons

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Scientific paper

We use the Gutzwiller variational many-body theory to investigate the stability of orbitally ordered states in a two-band Hubbard-model without spin degrees of freedom. Our results differ significantly from earlier Hartree-Fock calculations for this model. The Hartree-Fock phase diagram displays a large variety of orbital orders. In contrast, in the Gutzwiller approach orbital order only appears for densities in a narrow region around half filling.

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