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