Hot optical phonon decay in carbon nanotubes

Pennington, G.; Kilpatrick, S. J.; Wickenden, A. E.
September 2008
Applied Physics Letters;9/1/2008, Vol. 93 Issue 9, p093110
Academic Journal
We simulate hot optical phonon decay in small diameter (<0.7 nm) carbon nanotubes, solving the phonon Boltzmann transport equation using Monte Carlo methods incorporating the full phonon spectrum and phonon-phonon scattering. Results indicate decay times inversely proportional to the lattice temperature with negligible dependence on hot phonon polarization/wave vector or nanotube diameter and chirality. Nonequilibrium optical phonons with energies of ∼0.2 eV decay by emitting two ∼0.1 eV optical phonons, corresponding to out-of-plane polarization modes in graphitic materials. Modes polarized perpendicular to the nanotube axis may allow manipulation of hot phonon effects by the near environment of the nanotube.


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