Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Solitons in the Crossover between Band Insulator and Mott Insulator:
  Application to TTF-Chloranil under Pressure   Based on the Phase Hamiltonian, two types of solitons are found to exist in
the crossover region between band insulator and Mott insulator in
one-dimension. Both of these solitons have fractional charges but with
different spins, zero and 1/2, respectively. The results are in accord with the
experimental results by Kanoda et al. for TTF-Chloranil under pressure.

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The categories of this paper are: physics
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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio
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The categories of this paper are: alg-geom
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: astro-ph
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The categories of this paper are: cs
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The categories of this paper are: nlin
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph