Impact Excitation by Hot Carriers in Carbon Nanotubes

Details Impact Excitation by Hot Carriers in Carbon Nanotubes Impact Excitation by Hot Carriers in Carbon Nanotubes

2006-08-30

arxiv.org/abs/cond-mat/0608678v1

Phys. Rev. B 74, 121410(R) (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages 4 figures

Scientific paper

10.1103/PhysRevB.74.121410

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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