STM characterization of a graphitized SiC(0001)surface

ORAL

Abstract

The two-dimensional electron gas in a single graphene sheet exhibits unique properties due the cone-shaped electron band structure near the Fermi energy. Recently the growth of a single layer of graphene on SiC(0001) has been demonstrated, opening new possibilities for fabricating large scale graphene-based devices. We have performed scanning tunneling microscopy and spectroscopy of single and bi-layer graphene films on SiC(0001). Atomically resolved topographs and dI/dV maps show clear differences between the single and bi-layer surfaces at different length scales. We have characterized the energy dependence and spatial distribution of the electron local density of states in these single and bi-layer films.

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Authors

  • Victor Brar

    • Dept. of Physics, University of California, Berkeley
    • Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300

  • Yuanbo Zhang

    • University of California Berkeley
    • Columbia University
    • Dept. of Physics, University of California, Berkeley
    • UC Berkeley
    • Department of Physics, University of California at Berkeley

  • Yosef Yayon

    • Dept. of Physics, University of California, Berkeley
    • Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300

  • Taisuke Ohta

    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Jessica McChesney

    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Eli Rotenberg

    • Advanced Light Source, Lawrence Berkeley National Laboratory

  • Mike Crommie

    • Dept. of Physics, University of California, Berkeley
    • Department of Physics, University of California at Berkeley
    • University of California at Berkeley
    • Department of Physics, University of California at Berkeley, Berkeley, California 94720-7300