Abstract
We report transport measurements through graphene on substrates as a function of magnetic field , carrier density , and temperature . The large dielectric constant of very effectively screens long-range electron-electron interactions and potential fluctuations, making Dirac electrons in graphene virtually noninteracting. The absence of interactions results in an unexpected behavior of the longitudinal resistance in the Landau level and in a large suppression of the transport gap in nanoribbons. The “bulk” transport properties of graphene at , on the contrary, are completely unaffected by the substrate dielectric constant.
- Received 7 July 2011
DOI:https://doi.org/10.1103/PhysRevLett.107.225501
© 2011 American Physical Society