title: Coherent lattice vibrations in single-walled carbon nanotubes.
abstract: We have generated and detected coherent lattice vibrations in single-walled carbon nanotubes corresponding to the radial breathing mode (RBM) using ultrashort laser pulses. Because the band gap is a function of diameter, these RBM-induced diameter oscillations cause ultrafast band gap oscillations, thereby modulating the interband excitonic resonances at the phonon frequencies (3-9 THz). Excitation spectra show a large number of pronounced peaks, allowing the determination of the chiralities present in particular samples and relative population differences of particular chiralities between samples.
authors.affiliation: Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA.
authors.forename: Yong-Sik
authors.initials: YS
authors.lastname: Lim
authors.forename: Ki-Ju
authors.initials: KJ
authors.lastname: Yee
authors.forename: Ji-Hee
authors.initials: JH
authors.lastname: Kim
authors.forename: Erik H
authors.initials: EH
authors.lastname: Hároz
authors.forename: Jonah
authors.initials: J
authors.lastname: Shaver
authors.forename: Junichiro
authors.initials: J
authors.lastname: Kono
authors.forename: Stephen K
authors.initials: SK
authors.lastname: Doorn
authors.forename: Robert H
authors.initials: RH
authors.lastname: Hauge
authors.forename: Richard E
authors.initials: RE
authors.lastname: Smalley