Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Signature of a Z_2 vortex in the dynamical correlations of the
  triangular-lattice Heisenberg antiferromagnet   Dynamical properties of the classical Heisenberg antiferromagnet on the
triangular lattice are investigated by means of a spin-dynamics simulation and
an analytical calculation. While the model was suggested to exhibit a
topological transition driven by the Z_2-vortex binding-unbinding, weakness of
the associated thermodynamic singularity has made it difficult to observe the
evidence of the Z_2 vortex experimentally so far, only some indirect support.
Here, we show that the signature of the Z_2-vortex excitation and the
vortex-induced topological transition can be captured from the dynamical spin
correlations. In particular, the dynamical spin structure factor exhibits a
characteristic central peak around the Z_2-vortex transition, and this central
peak will be a fingerprint of the Z_2-vortex excitation.

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The categories of this paper are: atom-ph
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The categories of this paper are: acc-phys
3
The categories of this paper are: physics
19
The categories of this paper are: eess
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The categories of this paper are: bayes-an
9
The categories of this paper are: nlin
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The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
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The categories of this paper are: adap-org
12
The categories of this paper are: nucl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph