Determination of exciton-phonon coupling elements in single-walled carbon nanotubes by Raman overtone analysis.
Raman excitation profiles are obtained and compared for carbon nanotube radial breathing mode (RBM) fundamental and overtone vibrations for 5 specific chiralities. Fitting of the Raman excitation data is performed using Raman transform theory. The Huang-Rhys factors obtained from the modeling are directly related to the magnitude of the RBM exciton-phonon coupling element, which is shown to be in a weak coupling limit. The values of exciton-phonon coupling strengths and the possible role of revealed non-Condon effects are in agreement with quantum-chemical modeling.
Shreve
Andrew P
AP
Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
Haroz
Erik H
EH
Bachilo
Sergei M
SM
Weisman
R Bruce
RB
Tretiak
Sergei
S
Kilina
Svetlana
S
Doorn
Stephen K
SK