Transport through Graphene on SrTiO3

We report transport measurements through graphene on SrTiO3 substrates as a function of magnetic field B, carrier density n, and temperature T. The large dielectric constant of SrTiO3 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.