Electron-phonon coupling in suspended graphene: supercollisions by ripples.
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.
Low Temperature Laboratory, O.V. Lounasmaa Laboratory, Aalto University , P.O. Box 15100, FI-00076, AALTO, Finland.
Antti
A
Laitinen
Mika
M
Oksanen
Aurélien
A
Fay
Daniel
D
Cox
Matti
M
Tomi
Pauli
P
Virtanen
Pertti J
PJ
Hakonen