Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phase diagram for the exciton Mott transition in infinite-dimensional
  electron-hole systems   To understand the essence of the exciton Mott transition in three-dimensional
electron-hole systems, the metal-insulator transition is studied for a two-band
Hubbard model in infinite dimensions with interactions of electron-electron
(hole-hole) repulsion U and electron-hole attraction -U'. By using the
dynamical mean-field theory, the phase diagram in the U-U' plane is obtained
(which is exact in infinite dimensions) assuming that electron-hole pairs do
not condense. When both electron and hole bands are half-filled, two types of
insulating states appear: the Mott-Hubbard insulator for U > U' and the
biexciton-like insulator for U < U'. Even when away from half-filling, we find
the phase transition between the exciton- or biexciton-like insulator and a
metallic state. This transition can be assigned to the exciton Mott transition,
whereas the Mott-Hubbard transition is absent.

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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: bayes-an
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The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
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The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
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The categories of this paper are: acc-phys
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The categories of this paper are: chao-dyn
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The categories of this paper are: patt-sol
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The categories of this paper are: plasm-ph
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The categories of this paper are: math-ph