Optical Phonon Lineshapes and Transport in Metallic Carbon Nanotubes under High Bias Voltage

Details Optical Phonon Lineshapes and Transport in Metallic Carbon Nanotubes under High Bias Voltage Optical Phonon Lineshapes and Transport in Metallic Carbon Nanotubes under High Bias Voltage

2010-06-30

arxiv.org/abs/1006.5872v2

Phys. Rev. B 82, 195437 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages, 8 figures, minor changes, pusblished in PRB

Scientific paper

We calculate the current-voltage characteristic of metallic nanotubes at high bias voltage showing that a bottleneck exists for short nanotubes in contrast to large ones. We attribute this to a redistribution of lower-lying acoustic phonons caused by phonon-phonon scattering with hot optical phonons. The current-voltage characteristic and the electron and phonon distribution functions are derived analytically, and serve to obtain in a self-contained way the frequency shift and line broadening of the zone center optical phonons due to the electron-phonon coupling at high bias. We obtain a positive frequency shift from the zero bias shift and no broadening of the optical phonon mode at very high voltages, in agreement with recent experiments.

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