Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on the "Create Dirac Cones in Your Favorite Materials", by
  Chia-Hui Lin and Wei Ku (arXiv:1303.4822)   Recently a paper by Lin and Ku \cite{lin} was posted, where the authors
propose a very interesting idea to engineer the Dirac points in material which
originally did not have such points by inducing a CDW state through
introduction of impurities like vacancy, substitution, or intercalation. In
this comment we would like to explain the appearance of the Dirac points in
such engineered structures by symmetry arguments.

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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: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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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: physics
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The categories of this paper are: hep-ph
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The categories of this paper are: solv-int