Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Impact Excitation by Hot Carriers in Carbon Nanotubes   We investigate theoretically the efficiency of intra-molecular hot carrier
induced impact ionization and excitation processes in carbon nanotubes. The
electron confinement and reduced screening lead to drastically enhanced
excitation efficiencies over those in bulk materials. Strong excitonic coupling
favors neutral excitations over ionization, while the impact mechanism
populates a different set of states than that produced by photoexcitation. The
excitation rate is strongly affected by optical phonon excitation and a simple
scaling of the rate with the field strength and optical phonon temperature is
obtained.

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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: eess
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
31
The categories of this paper are: ao-sci
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The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
16
The categories of this paper are: stat