Effect of cluster formation on graphene mobility

K. M. McCreary, K. Pi, A. G. Swartz, Wei Han, W. Bao, C. N. Lau, F. Guinea, M. I. Katsnelson, and R. K. Kawakami

Phys. Rev. B 81, 115453 – Published 26 March 2010

Abstract

We investigate the effect of gold (Au) atoms in the form of both pointlike 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 pointlike 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 toward zero.

Received 23 November 2009

DOI:https://doi.org/10.1103/PhysRevB.81.115453

Authors & Affiliations

K. M. McCreary¹, K. Pi¹, A. G. Swartz¹, Wei Han¹, W. Bao¹, C. N. Lau¹, F. Guinea², M. I. Katsnelson³, and R. K. Kawakami^1,*

¹Department of Physics and Astronomy, University of California, Riverside, California 92521, USA
²Instituto de Ciencia de Materiales de Madrid, CSIC, Cantoblanco, E-28049 Madrid, Spain
³Institute for Molecules and Materials, Radboud University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, The Netherlands

^*roland.kawakami@ucr.edu

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Issue

Vol. 81, Iss. 11 — 15 March 2010

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