Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory of the tangential G-band feature in the Raman spectra of metallic
  carbon nanotubes   The tangential G-band in the Raman spectra of a metallic single-wall carbon
nanotube shows two peaks: a higher frequency component having the Lorentzian
shape and a lower-frequency component of lower intensity with a
Breit-Wigner-Fano (BWF)-type lineshape. This interesting feature has been
analyzed on the basis of phonon-plasmon coupling in a nanotube. It is shown
that while the gapless semi-acoustic plasmon cannot account for the observed
spectra as claimed by other investigators, the low-lying optical plasmon
corresponding to the tangential motion of the electrons on the nanotube surface
can explain the observed features. In particular, this theory can explain
occurrence of both the Lorentzian and BWF lineshapes in the G-band Raman
spectra of metallic single-wall carbon nanotubes. Furthermore, the theory shows
that the BWF peak moves to higher frequency, has a lower intensity and a lower
half width at higher diameters of the nanotube. All these features are in
agreement with experimental observations.

11
The categories of this paper are: hep-lat
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin