Skip to main content
Open Access Publications from the University of California

Imaging and tuning molecular levels at the surface of a gated graphene device.

  • Author(s): Riss, Alexander
  • Wickenburg, Sebastian
  • Tan, Liang Z
  • Tsai, Hsin-Zon
  • Kim, Youngkyou
  • Lu, Jiong
  • Bradley, Aaron J
  • Ugeda, Miguel M
  • Meaker, Kacey L
  • Watanabe, Kenji
  • Taniguchi, Takashi
  • Zettl, Alex
  • Fischer, Felix R
  • Louie, Steven G
  • Crommie, Michael F
  • et al.

Published Web Location

Gate-controlled tuning of the charge carrier density in graphene devices provides new opportunities to control the behavior of molecular adsorbates. We have used scanning tunneling microscopy (STM) and spectroscopy (STS) to show how the vibronic electronic levels of 1,3,5-tris(2,2-dicyanovinyl)benzene molecules adsorbed onto a graphene/BN/SiO2 device can be tuned via application of a backgate voltage. The molecules are observed to electronically decouple from the graphene layer, giving rise to well-resolved vibronic states in dI/dV spectroscopy at the single-molecule level. Density functional theory (DFT) and many-body spectral function calculations show that these states arise from molecular orbitals coupled strongly to carbon-hydrogen rocking modes. Application of a back-gate voltage allows switching between different electronic states of the molecules for fixed sample bias.

Many UC-authored scholarly publications are freely available on this site because of the UC's open access policies. Let us know how this access is important for you.

Main Content
Current View