title: Direct measurement of the lifetime of optical phonons in single-walled carbon nanotubes.
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+/-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.
authors.affiliation: Department of Physics and Electrical Engineering, Columbia University, New York, New York 10027, USA.
authors.forename: Daohua
authors.initials: D
authors.lastname: Song
authors.forename: Feng
authors.initials: F
authors.lastname: Wang
authors.forename: Gordana
authors.initials: G
authors.lastname: Dukovic
authors.forename: M
authors.initials: M
authors.lastname: Zheng
authors.forename: E D
authors.initials: ED
authors.lastname: Semke
authors.forename: Louis E
authors.initials: LE
authors.lastname: Brus
authors.forename: Tony F
authors.initials: TF
authors.lastname: Heinz