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Title: Imaging and tuning molecular levels at the surface of a gated graphene device
Authors: Riss, A
Wickenburg, S
Tan, L.Z
Tsai, H.-Z
Kim, Y
Lu, J 
Bradley, A.J
Ugeda, M.M
Meaker, K.L
Watanabe, K
Taniguchi, T
Zettl, A
Fischer, F.R
Louie, S.G
Crommie, M.F
Keywords: Density functional theory
Electronic states
Molecular orbitals
Scanning tunneling microscopy
Back-gate voltages
Benzene molecules
Molecular adsorbate
Organic molecules
Scanning tunneling spectroscopy
Self energy
Single molecule level
Vibronic levels
Issue Date: 2014
Publisher: American Chemical Society
Citation: Riss, A, Wickenburg, S, Tan, L.Z, Tsai, H.-Z, Kim, Y, Lu, J, Bradley, A.J, Ugeda, M.M, Meaker, K.L, Watanabe, K, Taniguchi, T, Zettl, A, Fischer, F.R, Louie, S.G, Crommie, M.F (2014). Imaging and tuning molecular levels at the surface of a gated graphene device. ACS Nano 8 (6) : 5395-5401. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
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. © 2014 American Chemical Society.
Source Title: ACS Nano
ISSN: 1936-0851
DOI: 10.1021/nn501459v
Rights: Attribution 4.0 International
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