title: Imaging and tuning molecular levels at the surface of a gated graphene device.
abstract: 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.
authors.affiliation: Department of Physics, §Department of Chemical and Biomolecular Engineering, ⊥Department of Chemistry, University of California , Berkeley, California 94720, United States.
authors.forename: Alexander
authors.initials: A
authors.lastname: Riss
authors.forename: Sebastian
authors.initials: S
authors.lastname: Wickenburg
authors.forename: Liang Z
authors.initials: LZ
authors.lastname: Tan
authors.forename: Hsin-Zon
authors.initials: HZ
authors.lastname: Tsai
authors.forename: Youngkyou
authors.initials: Y
authors.lastname: Kim
authors.forename: Jiong
authors.initials: J
authors.lastname: Lu
authors.forename: Aaron J
authors.initials: AJ
authors.lastname: Bradley
authors.forename: Miguel M
authors.initials: MM
authors.lastname: Ugeda
authors.forename: Kacey L
authors.initials: KL
authors.lastname: Meaker
authors.forename: Kenji
authors.initials: K
authors.lastname: Watanabe
authors.forename: Takashi
authors.initials: T
authors.lastname: Taniguchi
authors.forename: Alex
authors.initials: A
authors.lastname: Zettl
authors.forename: Felix R
authors.initials: FR
authors.lastname: Fischer
authors.forename: Steven G
authors.initials: SG
authors.lastname: Louie
authors.forename: Michael F
authors.initials: MF
authors.lastname: Crommie
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