Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Irradiation-induced broadening of the Raman spectra in monolayer
  graphene   Broadening of the Raman scattering (RS) spectra was studied in monolayer
graphene samples irradiated with various dose of ions followed by annealing of
radiation damage at different temperatures. It is shown that the width {\Gamma}
(full width at half maximum, FWHM) of three main RS lines (G-, D-, and 2D)
increases linearly with increase of the density of irradiation-induced point
defects N d as {\Delta}{\Gamma} = m N d . The slope m of the linear
dependencies is the same for one-phonon emitting G-line and D-line, and almost
double for two-phonon emitting 2D-line. It is also shown that the width of
D-line {\Gamma} D for all samples is larger than one half of the width of
2D-line {\Gamma} 2D , which shows that in the case of D-line, elastic electron
scattering on point defects leads to an additional decreasing the lifetime of
the emitted phonon. Theoretical model of the width of D-line in disordered
graphene is developed which explains the experimental observations and allows
to determine the numerical coefficient in the in-plane transverse optic phonon
dispersion in graphene.

16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn