▎ 摘　　要

Using electrical transport experiments and shot noise thermometry, we find strong evidence that "super-collision" scattering processes by flexural modes are the dominant electron-phonon energy transfer mechanism in high-quality, suspended graphene around room temperature. the temperature exponent by two is reflected in the quadratic changes from cubic to quintic with temperature. The change of The power law dependence of the electron-phonon coupling dependence on chemical potential, which is an inherent feature of two-phonon quantum processes.