Direct observation of mode selective electron-phonon coupling in suspended carbon nanotubes.
Raman spectra of individual pristine suspended single-walled carbon nanotubes are observed under high electrical bias. The LO and TO modes of the G band behave differently with respect to voltage bias, indicating preferential electron-phonon coupling and nonequilibrium phonon populations, which cause negative differential conductance in suspended devices. By correlating the electron resistivity to the optically measured phonon population, the data are fit using a Landauer model to determine the key scattering parameters.
Bushmaker
Adam W
AW
Department of Electrical Engineering, University of Southern California, Los Angeles, CA 90089, USA.
Deshpande
Vikram V
VV
Bockrath
Marc W
MW
Cronin
Stephen B
SB
D004563:Electrochemistry; D004583:Electrons; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D036103:Nanotechnology; D037742:Nanotubes, Carbon / Q000737:chemistry*; D053770:Nanowires; D013059:Spectrum Analysis, Raman; D013816:Thermodynamics
D037742:Nanotubes, Carbon