Abstract
Rotation and reflection symmetries impose that out-of-plane (flexural) phonons of freestanding graphene membranes have a quadratic dispersion at long wavelength and can be excited by charge carriers in pairs only. As a result, we find that flexural phonons dominate the phonon contribution to the resistivity below a crossover temperature where we obtain an anomalous temperature dependence . The logarithmic factor arises from renormalizations of the flexural-phonon dispersion due to coupling between bending and stretching degrees of freedom of the membrane.
- Received 13 August 2007
DOI:https://doi.org/10.1103/PhysRevLett.100.076801
©2008 American Physical Society