Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Orbital order in degenerate Hubbard models : A variational study   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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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: chem-ph
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org