We investigate the effect of gold (Au) atoms in the form of both point-like charged impurities and clusters on the transport properties of graphene. Cryogenic deposition (18 K) of Au decreases the mobility and shifts the Dirac point in a manner that is consistent with scattering from point-like charged impurities. Increasing the temperature to room temperature promotes the formation of clusters, which is verified with atomic force microscopy. We find that for a fixed amount of Au impurities, the formation of clusters enhances the mobility and causes the Dirac point to shift back towards zero.
Cite
@article{arxiv.1003.0650,
title = {The Effect of Cluster Formation on Graphene Mobility},
author = {K. M. McCreary and K. Pi and Adrian Swartz and Wei Han and W. Bao and C. N. Lau and F. Guinea and M. I. Katsnelson and R. K. Kawakami},
journal= {arXiv preprint arXiv:1003.0650},
year = {2010}
}