Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong phonon-plasmon coupled modes in the graphene/silicon carbide
  heterosystem   We report on strong coupling of the charge carrier plasmon $\omega_{PL}$ in
graphene with the surface optical phonon $\omega_{SO}$ of the underlying
SiC(0001) substrate with low electron concentration ($n=1.2\times 10^{15}$
$cm^{-3}$) in the long wavelength limit ($q_\parallel \rightarrow 0$). Energy
dependent energy-loss spectra give for the first time clear evidence of two
coupled phonon-plasmon modes $\omega_\pm$ separated by a gap between
$\omega_{SO}$ ($q_\parallel \rightarrow 0$) and $\omega_{TO}$ ($q_\parallel >>
0$), the transverse optical phonon mode, with a Fano-type shape, in particular
for higher primary electron energies ($E_0 \ge 20eV$). A simplified model based
on dielectric theory is able to simulate our energy - loss spectra as well as
the dispersion of the two coupled phonon-plasmon modes $\omega_\pm$. In
contrast, Liu and Willis [1] postulate in their recent publication no gap and a
discontinuous dispersion curve with a one-peak structure from their energy-loss
data.

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The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
36
The categories of this paper are: cmp-lg
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
16
The categories of this paper are: stat