Direct Measurement of the Lifetime of Optical Phonons in Single-Walled Carbon Nanotubes

Daohua Song, Feng Wang, Gordana Dukovic, M. Zheng, E. D. Semke, Louis E. Brus, and Tony F. Heinz

Phys. Rev. Lett. 100, 225503 – Published 4 June 2008

Abstract

Time-resolved anti-Stokes Raman spectroscopy has been applied to probe the dynamics of optical phonons created in single-walled carbon nanotubes by femtosecond laser excitation. From measurement of the decay of the anti-Stokes Raman signal in semiconducting nanotubes of $(6, 5)$ chiral index, a room-temperature lifetime for $G$ -mode phonons of $1.1 \pm 0.2 ps$ has been determined. This lifetime, which reflects the anharmonic coupling of the $G$ -mode phonons to lower-frequency phonons, is important in assessing the role of nonequilibrium phonon populations in high-field transport phenomena.

Received 1 August 2007

DOI:https://doi.org/10.1103/PhysRevLett.100.225503

Authors & Affiliations

Daohua Song¹, Feng Wang^1,*, Gordana Dukovic², M. Zheng³, E. D. Semke³, Louis E. Brus², and Tony F. Heinz^1,†

¹Departments of Physics and Electrical Engineering, Columbia University, New York, New York 10027, USA
²Department of Chemistry, Columbia University, New York, New York 10027, USA
³DuPont Central Research and Development, Wilmington, Delaware 19880, USA

^*Current address: Department of Physics, University of California, Berkeley, CA 94720, USA.
^†Corresponding author. tony.heinz@columbia.edu

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Vol. 100, Iss. 22 — 6 June 2008

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