Effect of high-k environment on charge carrier mobility in graphene
Mesoscale and Nanoscale Physics
2010-08-27 v2 Materials Science
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-k 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 currently attainable for graphene on a substrate.
Keywords
Cite
@article{arxiv.0809.1162,
title = {Effect of high-k environment on charge carrier mobility in graphene},
author = {L. A. Ponomarenko and R. Yang and T. M. Mohiuddin and S. M. Morozov and A. A. Zhukov and F. Schedin and E. W. Hill and K. S. Novoselov and M. I. Katsnelson and A. K. Geim},
journal= {arXiv preprint arXiv:0809.1162},
year = {2010}
}
Comments
further experiments proving the point are reported in the final version