Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Crossover between Liquid and Solid Electron Phases in Quantum Dots:
  A Large-Scale Configuration-Interaction Study   We study the crossover between liquid and solid electron phases in a
two-dimensional harmonic trap as the density is progressively diluted. We infer
the formation of geometrically ordered phases from charge distributions and
pair correlation functions obtained via a large scale configuration interaction
calculation.

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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
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The categories of this paper are: adap-org
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
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The categories of this paper are: hep-lat
3
The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: econ
12
The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
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The categories of this paper are: eess