Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Direct observation of excitonic instability in
  Ta$_2$NiSe$_5$" [arXiv:2007.08212 (2020)]   The origin of the second order phase transition at 328K in Ta$_2$NiSe$_5$, a
prominent candidate for direct gap excitonic insulator, remains under fervent
debate. The driving force for the transition can be revealed by identification
of the soft mode's origin that may be deducted from polarization resolved Raman
scattering experiments. Such studies were recently reported in
[arXiv:2007.07344 (2020)], [arXiv:2102.07912 (2021)], [arXiv:2007.01723 (2020)]
and [arXiv:2007.08212 (2020)]. In this Comment, it is shown that the parameters
derived in a recent arXiv by Kwangrae Kim et. al. [arXiv:2007.08212 (2020)],
including the Weiss temperature for excitonic transition, are based on
inconsistent data.

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The categories of this paper are: cmp-lg
26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
9
The categories of this paper are: nlin
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
24
The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
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The categories of this paper are: eess
32
The categories of this paper are: atom-ph