Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Isotopic effects on the thermal conductivity of graphene nanoribbons:
  localization mechanism   Thermal conductivity of graphene nanoribbons (GNR) with length 106~{\AA} and
width 4.92~{\AA} after isotopic doping is investigated by molecular dynamics
with quantum correction. Two interesting phenomena are found: (1) isotopic
doping reduces thermal conductivity effectively in low doping region, and the
reduction slows down in high doping region; (2) thermal conductivity increases
with increasing temperature in both pure and doped GNR; but the increasing
behavior is much more slowly in the doped GNR than that in pure ones. Further
studies reveal that the physics of these two phenomena is related to the
localized phonon modes, whose number increases quickly (slowly) with increasing
isotopic doping in low (high) isotopic doping region.

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The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg