Ultrafast exciton dephasing in semiconducting single-walled carbon nanotubes

Ying-Zhong Ma, Matthew W Graham, Graham R Fleming, Alexander A Green, Mark C Hersam
Physical Review Letters 2008 November 21, 101 (21): 217402
Femtosecond two-pulse degenerate four-wave mixing spectroscopy was applied to study the exciton dephasing in a broad range of excitation intensities and lattice temperatures. We find that both exciton-exciton and exciton-phonon scattering have profound effects on the dephasing process. The dominant phonon mode involved in the dephasing is identified as the out-of-plane, transverse optical mode with a frequency of 847 cm(-1). The extracted homogeneous linewidths at all measured temperatures are in excellent agreement with the results of a single-tube photoluminescence experiment.

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