Doping dependence of C$_{60}$ monolayers studied by scanning tunneling microscopy

ORAL

Abstract

The electronic properties of C$_{60}$ compounds can be tuned by charge-doping them with alkali impurities. This results in an interplay between molecular charge transfer, Coulomb repulsion, phonon coupling, and nearest neighbor interactions. Here we present a scanning tunneling microscopy/spectroscopy study of K doped C$_{60}$ monolayers on Au(111). We find that the morphology and electronic structure of C$_{60}$ monolayers change significantly with doping level. In addition to LUMO/LUMO+1 shifts, we observe strong variations in the low-energy local density of states.

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Authors

  • Ryan Yamachika

  • Andre Wachowiak

    • Department of Physics, University of California at Berkeley and Material Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California

  • Michael Grobis

  • Michael Crommie

    • Department of Physics, University of California, Berkeley, Materials Sciences Division Lawrence Berkeley National Laboratory, Berkeley, CA
    • Department of Physics, University of California, Berkeley
    • Department of Physics, University of California at Berkeley and Material Sciences Division, Lawrence Berkeley Laboratory
    • U.C. Berkeley Physics Dept. and Material Science Division, LBNL