title: Effect of a high-kappa environment on charge carrier mobility in graphene.
abstract: It is widely assumed that the dominant source of scattering in graphene is charged impurities in a substrate. We have tested this conjecture by studying graphene placed on various substrates and in high-kappa media. Unexpectedly, we have found no significant changes in carrier mobility either for different substrates or by using glycerol, ethanol, and water as a top dielectric layer. This suggests that Coulomb impurities are not the scattering mechanism that limits the mean free path attainable for graphene on a substrate.
authors.affiliation: Manchester Centre for Mesoscience and Nanotechnology, University of Manchester, Manchester M13 9PL, United Kingdom.
authors.forename: L A
authors.initials: LA
authors.lastname: Ponomarenko
authors.forename: R
authors.initials: R
authors.lastname: Yang
authors.forename: T M
authors.initials: TM
authors.lastname: Mohiuddin
authors.forename: M I
authors.initials: MI
authors.lastname: Katsnelson
authors.forename: K S
authors.initials: KS
authors.lastname: Novoselov
authors.forename: S V
authors.initials: SV
authors.lastname: Morozov
authors.forename: A A
authors.initials: AA
authors.lastname: Zhukov
authors.forename: F
authors.initials: F
authors.lastname: Schedin
authors.forename: E W
authors.initials: EW
authors.lastname: Hill
authors.forename: A K
authors.initials: AK
authors.lastname: Geim