Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Coherent Lattice Vibrations in Carbon Nanotubes   We have generated and detected the radial-breathing mode of coherent lattice
vibrations in single-walled carbon nanotubes using ultrashort laser pulses.
Because the band gap is a function of diameter, these diameter oscillations
cause ultrafast band gap oscillations, modulating interband excitonic
resonances at the phonon frequencies (3-9 THz). Excitation spectra show a large
number of pronounced peaks, mapping out chirality distributions in great
detail.

17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th