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Open Access Publications from the University of California

Tuning charge and correlation effects for a single molecule on a graphene device

  • Author(s): Wickenburg, S
  • Lu, J
  • Lischner, J
  • Tsai, HZ
  • Omrani, AA
  • Riss, A
  • Karrasch, C
  • Bradley, A
  • Jung, HS
  • Khajeh, R
  • Wong, D
  • Watanabe, K
  • Taniguchi, T
  • Zettl, A
  • Neto, AHC
  • Louie, SG
  • Crommie, MF
  • et al.

© The Author(s) 2016. The ability to understand and control the electronic properties of individual molecules in a device environment is crucial for developing future technologies at the nanometre scale and below. Achieving this, however, requires the creation of three-terminal devices that allow single molecules to be both gated and imaged at the atomic scale. We have accomplished this by integrating a graphene field effect transistor with a scanning tunnelling microscope, thus allowing gate-controlled charging and spectroscopic interrogation of individual tetrafluoro-tetracyanoquinodimethane molecules. We observe a non-rigid shift in the molecule's lowest unoccupied molecular orbital energy (relative to the Dirac point) as a function of gate voltage due to graphene polarization effects. Our results show that electron-electron interactions play an important role in how molecular energy levels align to the graphene Dirac point, and may significantly influence charge transport through individual molecules incorporated in graphene-based nanodevices.

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