Abstract
We have studied temperature dependences of electron transport in graphene and its bilayer and found extremely low electron-phonon scattering rates that set the fundamental limit on possible charge carrier mobilities at room temperature. Our measurements show that mobilities higher than are achievable, if extrinsic disorder is eliminated. A sharp (thresholdlike) increase in resistivity observed above is unexpected but can qualitatively be understood within a model of a rippled graphene sheet in which scattering occurs on intraripple flexural phonons.
- Received 3 November 2007
DOI:https://doi.org/10.1103/PhysRevLett.100.016602
©2008 American Physical Society