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Electron-phonon coupling in suspended graphene: supercollisions by ripples
Antti Laitinen1, Mika Oksanen, Aurélien Fay
1Low Temperature Laboratory, O.V. Lounasmaa Laboratory, Aalto University , P.O. Box 15100, FI-00076, AALTO, Finland.
Nano Letters
|May 21, 2014
Abstract:
Using electrical transport experiments and shot noise thermometry, we find strong evidence that "supercollision" scattering processes by flexural modes are the dominant electron-phonon energy transfer mechanism in high-quality, suspended graphene around room temperature. The power law dependence of the electron-phonon coupling changes from cubic to quintic with temperature. The change of the temperature exponent by two is reflected in the quadratic dependence on chemical potential, which is an inherent feature of two-phonon quantum processes.