title: Transport through graphene on SrTiO3.
abstract: We report transport measurements through graphene on SrTiO(3) substrates as a function of magnetic field B, carrier density n, and temperature T. The large dielectric constant of SrTiO(3) 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 N=0 Landau level and in a large suppression of the transport gap in nanoribbons. The "bulk" transport properties of graphene at B=0 T, on the contrary, are completely unaffected by the substrate dielectric constant.
authors.affiliation: Départment de Physique de la Matiére Condensée (DPMC) and Group of Applied Physics (GAP), University of Geneva, 24 Quai Ernest-Ansermet, 1211 Genéve 4, Switzerland.
authors.forename: Nuno J G
authors.initials: NJ
authors.lastname: Couto
authors.forename: Benjamin
authors.initials: B
authors.lastname: Sacépé
authors.forename: Alberto F
authors.initials: AF
authors.lastname: Morpurgo