Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Phonon Band Structure of Graphene using C$^{12} and
  C$^{13}$ Isotopes   Using very uniform large scale chemical vapor deposition grown graphene
transferred onto silicon, we were able to identify 15 distinct Raman lines
associated with graphene monolayers. This was possible thanks to a combination
of different carbon isotopes and different Raman laser energies and extensive
averaging without increasing the laser power. This allowed us to obtain a
detailed experimental phonon dispersion relation for many points in the
Brillouin zone. We further identified a D+D' peak corresponding to a double
phonon process involving both an inter- and intra-valley phonon.

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The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
23
The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: q-alg
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
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The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
1
The categories of this paper are: cs
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The categories of this paper are: eess