Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of three-spin interaction on thermal entanglement in Heisenberg
  XXZ model   The effect of three-spin interaction k on thermal entanglement between
alternate qubits is studied using pairwise concurrence C and energy level
diagram. It is found that k breaks the symmetry about the effect of magnetic
field h on C. It shifts a dip structure and gradually effaces a boot structure
when |k|<|J| (J is spin exchange coupling). A peak with C maintains 1 appears
and expands, elbowing the dip backwards when |k|>|J|. A sudden change of the
concurrence occurs around |k|=|J|, h=-k. Similar conclusions about
nearest-neighbor qubits are directly given.

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The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
20
The categories of this paper are: acc-phys
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The categories of this paper are: hep-ex
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The categories of this paper are: stat
31
The categories of this paper are: ao-sci
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The categories of this paper are: nlin
17
The categories of this paper are: q-fin
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int