The Effect of Cluster Formation on Graphene Mobility

ORAL

Abstract

The transport properties of graphene are strongly influenced by the presence of impurities on the surface. Additionally, the structure of the impurities, whether in the form of clusters or isolated adatoms, has an effect on scattering. Using molecular beam epitaxy, small amounts of gold impurities are introduced to the graphene surface. When deposited at low temperatures, the resulting decrease in mobility and a shift in Dirac point is consistent with scattering from point-like charged impurities. To investigate the effect of the formation of clusters, the temperature is slowly raised to room temperature while transport properties are monitored. For a fixed amount of gold impurities, it is discovered that the formation of clusters significantly enhances the mobility and causes the Dirac point to shift back toward zero.

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Authors

  • Kathleen McCreary

    UC Riverside

  • Keyu Pi

    UC Riverside, University of California, Riverside

  • Adrian Swartz

    UC Riverside

  • Wei Han

    UC Riverside, University of California, Riverside

  • Wenzhong Bao

    UC Riverside, Department of Physics and Astronomy, University of California at Riverside, University of California, Riverside

  • Chun Ning Lau

    UC Riverside, Department of Physics and Astronomy, University of California at Riverside, University of California, Riverside

  • Francisco Guinea

    Instituto de Ciencias de Materiales de Madrid, CSIS, ICMM, Madrid

  • Misha Katsnelson

    Institute for Molecules and Materials, Radboud University of Nijmegen, Radboud University Nijmegen, The Netherlands, Radboud University of Nijmegen, The Netherlands

  • Shan-Wen Tsai

    UC Riverside, University of California at Riverside, University of California, Riverside

  • Roland Kawakami

    UC Riverside, University of California, Riverside