Optical Determination of Electron-Phonon Coupling in Carbon Nanotubes
Y. Yin (1), A. Vamivakas (2), A. Walsh (1), S. Cronin (3), M. S. Unlu, (2, 1), B. B Goldberg (1, 2), and A. K. Swan (2) ((1) Physics, Department, Boston University, (2) Electrical, Computer Engineering, Department, Boston University, (3) Electrical Engineering Department,
TL;DR
This paper introduces an optical method to directly measure electron-phonon coupling in carbon nanotubes by analyzing resonant Raman excitation profiles, applicable to various low-dimensional systems.
Contribution
The study presents a novel optical technique for quantifying electron-phonon interactions in 1D and 0D materials, independent of photoluminescence.
Findings
Electron-phonon coupling strengths range from 3-11 meV.
Coupling varies with nanotube chirality and diameter.
Results agree with theoretical calculations.
Abstract
We report on an optical method to directly measure electron-phonon coupling in carbon nanotubes by correlating the first and second harmonic of the resonant Raman excitation profile. The method is applicable to 1D and 0D systems and is not limited to materials that exhibit photoluminescence. Experimental results for electron-phonon coupling with the radial breathing mode in 5 different nanotubes show coupling strengths from 3-11 meV, depending on chirality. The results are in good agreement with the chirality and diameter dependence calculated by Goupalov et al.
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