Ultrafast Exciton Dephasing in Semiconducting Single-Walled Carbon Nanotubes

被引：41

作者：

Ma, Ying-Zhong

Graham, Matthew W.

Fleming, Graham R. ^{[1
]}

Green, Alexander A. ^{[2
]}

Hersam, Mark C. ^{[2
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 101卷 / 21期

关键词：

Single-walled carbon nanotubes (SWCN) - Yarn - Four wave mixing - Phonons;

D O I：

10.1103/PhysRevLett.101.217402

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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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页数：4

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