Coherent lattice vibrations in single-walled carbon nanotubes.
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.
Lim
Yong-Sik
YS
Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, USA.
Yee
Ki-Ju
KJ
Kim
Ji-Hee
JH
Hároz
Erik H
EH
Shaver
Jonah
J
Kono
Junichiro
J
Doorn
Stephen K
SK
Hauge
Robert H
RH
Smalley
Richard E
RE