Optical phonon lifetimes in single-walled carbon nanotubes by time-resolved Raman scattering.
The lifetimes of optical phonons (OPs) in single-walled carbon nanotubes are determined by time-resolved incoherent anti-Stokes Raman scattering using a subpicosecond pump-probe method. Lifetimes in semiconducting and metallic nanotubes at room temperature are similar, 1.2 and 0.9 ps, respectively. The OP lifetimes decrease with increasing temperature, approximately scaling as approximately 1/T, consistent with anharmonic processes being the dominant decay mechanism for both semiconducting and metallic nanotubes.
Frederick Seitz Materials Research Laboratory, Department of Materials Science and Engineering, University of Illinois, Urbana, Illinois 61801, USA. kgkang@illinois.edu
Kwangu
K
Kang
Taner
T
Ozel
David G
DG
Cahill
Moonsub
M
Shimt