Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Two-Dimensional Electron-Hole Systems in a Strong Magnetic Field:
  Composite Fermion Picture for Multi-Component Plasmas   Electron-hole systems on a Haldane sphere are studied by exact numerical
diagonalization. Low lying states contain one or more types of bound charged
excitonic complexes Xk-, interacting through appropriate pseudopotentials.
Incompressible ground states of such multi-component plasmas are found. A
generalized multi-component Laughlin wavefunction and composite Fermion picture
are shown to predict the low lying states of an electron-hole gas at any value
of the magnetic field.

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The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
12
The categories of this paper are: nucl-th
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The categories of this paper are: nlin
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
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The categories of this paper are: plasm-ph
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The categories of this paper are: stat
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The categories of this paper are: astro-ph
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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: alg-geom
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The categories of this paper are: dg-ga
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an