Web Release Date: November 2,
Coherent Lattice Vibrations in Single-Walled Carbon Nanotubes
roz,##
#
Department of Electrical and Computer Engineering, Rice University, Houston, Texas 77005, Department of Applied Physics, Konkuk University, Chungju, Chungbuk 380-701, Republic of Korea, Department of Physics, Chungnam National University, Daejeon 305-764, Republic of Korea, Division of Chemistry, Chemical Science & Engineering, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and Carbon Nanotechnology Laboratory, Rice University, Houston, Texas 77005
Received July 12, 2006
Revised September 27, 2006
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.
Download the full text: PDF | HTML
