Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electronic phase transitions in the half-filled ionic Hubbard model   A detailed study of electronic phase transitions in the ionic Hubbard model
at half filling is presented. Within the dynamical mean field approximation a
series of transitions from the band insulator via a metallic state to a
Mott-Hubbard insulating phase is found at intermediate values of the one-body
potential $\Delta$ with increasing the Coulomb interaction $U$. We obtain a
critical region in which the metallic phase disappears and a {\it novel}
coexistence phase between the band and the Mott insulating state sets in. Our
results are consistent with those obtained at low dimensions, thus they provide
a concrete description for the charge degrees of freedom of the ionic Hubbard
model.

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The categories of this paper are: atom-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: q-alg
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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: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: adap-org
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The categories of this paper are: gr-qc