title: Ultrafast exciton dephasing in semiconducting single-walled carbon nanotubes.
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 847 cm(-1). The extracted homogeneous linewidths at all measured temperatures are in excellent agreement with the results of a single-tube photoluminescence experiment.
authors.affiliation: Department of Chemistry, University of California, Berkeley, California 94720-1460, USA.
authors.forename: Ying-Zhong
authors.initials: YZ
authors.lastname: Ma
authors.forename: Matthew W
authors.initials: MW
authors.lastname: Graham
authors.forename: Graham R
authors.initials: GR
authors.lastname: Fleming
authors.forename: Alexander A
authors.initials: AA
authors.lastname: Green
authors.forename: Mark C
authors.initials: MC
authors.lastname: Hersam