Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Slave-boson theory of the Mott transition in the two-band Hubbard model   We apply the slave-boson approach of Kotliar and Ruckenstein to the two-band
Hubbard model with an Ising like Hund's rule coupling and bands of different
widths. On the mean-field level of this approach we investigate the Mott
transition and observe both separate and joint transitions of the two bands
depending on the choice of the inter- and intraorbital Coulomb interaction
parameters. The mean-field calculations allow for a simple physical
interpretation and can confirm several aspects of previous work. Beside the
case of two individually half-filled bands we also examine what happens if the
original metallic bands possess fractional filling either due to finite doping
or due to a crystal field which relatively shifts the atomic energy levels of
the two orbitals. For appropriate values of the interaction and of the crystal
field we can observe a a band insulating state and a ferromagnetic metal.

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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int