Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Vibrational and Thermal Properties of ZnX (X=Se, Te): Density Functional
  Theory (LDA and GGA) versus Experiment   We calculated the phonon dispersion relations of ZnX (X=Se, Te) employing ab
initio techniques. These relations have been used to evaluate the temperature
dependence of the respective specific heats of crystals with varied isotopic
compositions. These results have been compared with mea- surements performed on
crystals down to 2 K. The calculated and measured data are generally in
excellent agreement with each other. Trends in the phonon dispersion relations
and the correspond- ing densities of states for the zinc chalcogenide series of
zincblende-type materials are discussed.

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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: cmp-lg
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The categories of this paper are: physics
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The categories of this paper are: stat
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The categories of this paper are: nlin
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: gr-qc
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The categories of this paper are: atom-ph
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph