Resonant coherent phonon generation in single-walled carbon nanotubes through near-band-edge excitation.
We have observed large-amplitude coherent phonon oscillations of radial breathing modes (RBMs) in single-walled carbon nanotubes excited through the lowest-energy (E(11)) interband transitions. In contrast to the previously studied coherent phonons excited through higher-energy (E(22)) transitions, these RBMs show comparable intensities between (n-m) mod 3 = +1 and -1 nanotubes. We also find the novel observation of RBMs excited over an excitation range of approximately 300 meV above the E(11) transition, which we attribute to possible resonance with phonon sidebands of the lowest optical transition, arising from strong exciton-phonon coupling.
Lim
Yong-Sik
YS
Department of Applied Physics, Konkuk University, Chungju, Chungbuk 380-701, Republic of Korea. yslim@kku.ac.kr
Ahn
Jae-Geum
JG
Kim
Ji-Hee
JH
Yee
Ki-Ju
KJ
Joo
Taiha
T
Baik
Sung-Hoon
SH
Hároz
Erik H
EH
Booshehri
Layla G
LG
Kono
Junichiro
J
D003460:Crystallization / Q000379:methods*; D008027:Light; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D017785:Photons; D012542:Scattering, Radiation; D013499:Surface Properties
D046911:Macromolecular Substances; D037742:Nanotubes, Carbon