Web Release Date: November 20,
Direct Observation of Mode Selective Electron-Phonon Coupling in Suspended Carbon Nanotubes
and
Department of Electrical Engineering, University of Southern California, Los Angeles, California 90089, and Applied Physics, California Institute of Technology, Pasadena, California 91125
Received July 27, 2007
Revised October 19, 2007
Abstract:
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.
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