Ultrafast exciton dephasing in semiconducting single-walled carbon nanotubes

Ying Zhong Ma, Matthew W. Graham, Graham R. Fleming, Alexander A. Green, Mark C. Hersam

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Abstract

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 847cm-1. The extracted homogeneous linewidths at all measured temperatures are in excellent agreement with the results of a single-tube photoluminescence experiment.

Original languageEnglish
Article number217402
JournalPhysical review letters
Volume101
Issue number21
DOIs
Publication statusPublished - Nov 18 2008

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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