Phonon and Electronic Non-radiative Decay of Excitons in Carbon Nanotubes

Details Phonon and Electronic Non-radiative Decay of Excitons in Carbon Nanotubes Phonon and Electronic Non-radiative Decay of Excitons in Carbon Nanotubes

2008-04-04

arxiv.org/abs/0804.0767v2

Phys. Rev. Lett. 101, 057401 (2008).

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, + 7 pages, 3 figures in attached appendix

Scientific paper

10.1103/PhysRevLett.101.057401

We investigate theoretically the rates of non-radiative decay of excited semiconducting nanotubes by a variety of decay mechanisms and compare with experimental findings. We find that the multi-phonon decay (MPD) of free excitons is too slow to be responsible for the experimentally observed lifetimes. However, MPD lifetimes of localized excitons could be 2-3 orders of magnitude shorter. We also propose a new decay mechanism that relies on a finite doping of nanotubes and involves exciton decay into an optical phonon and an intraband electron-hole pair. The resulting lifetime is in the range of 5 to 100 ps, even for a moderate doping level.

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