Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Low-density crystals in charged colloids : Comparison with Yukawa theory   Charged colloids can behave as Yukawa systems, with similar phase behaviour.
Using particle- resolved studies, we consider a system with an unusually long
Debye screening length which forms crystals at low colloid volume fraction
{\phi} ~ 0.01. We quantitatively compare this system with the Yukawa model and
find that its freezing point is compatible with the theoretical prediction but
that the crystal polymorph is not always that expected. In particular we find
body-centred cubic crystals where face-centred cubic crystals are expected.

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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
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The categories of this paper are: dg-ga
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: bayes-an
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: quant-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