Ponomarenko, L. A. and Yang, R. and Mohiuddin, T. M. and Katsnelson, M. I. and Novoselov, K. S. and Morozov, S. V. and Zhukov, A. A. and Schedin, F. and Hill, E. W. and Geim, A. K. (2009) Effect of a high-κ environment on charge carrier mobility in graphene. Physical review letters, 102 (20): 206603. ISSN 0031-9007
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-κ 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.