Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron-hole liquid in the hexaborides   We investigate the energetics of the electron-hole liquid in stoichiometric
divalent metal hexaborides. The ground state energy of an electron-hole plasma
is calculated using RPA and Hubbard schemes and compared to the binding energy
of a single exciton. Intervalley scattering processes play an important role in
increasing this binding energy and stabilizing a dilute Bose gas of excitons.

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The categories of this paper are: eess
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: atom-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: alg-geom
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The categories of this paper are: econ
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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: physics
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga