Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ground-state properties of the spin-1/2 Heisenberg-Ising bond
  alternating chain with Dzyaloshinskii-Moriya interaction   Ground-state energy is exactly calculated for the spin-1/2 Heisenberg-Ising
bond alternating chain with the Dzyaloshinskii-Moriya interaction. Under
certain condition, which relates a strength of the Ising, Heisenberg and
Dzyaloshinskii-Moriya interactions, the ground-state energy exhibits an
interesting nonanalytic behavior accompanied with a gapless excitation
spectrum.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: mtrl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: eess
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: math