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

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Title: Tuning charge and correlation effects for a single molecule on a graphene device
Authors: 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
Castro Neto, AH
Louie, SG
Crommie, MF
Item Type: Journal Article
Abstract: The ability to understand and control the electronic properties of individual molecules in a device environment is crucial for developing future technologies at the nanometer 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, a difficult challenge. We have accomplished this by integrating a field effect transistor (FET) with a scanning tunneling microscope (STM), thus enabling isolated molecules on a graphene surface to be electrostatically gated and spectroscopically interrogated. Using this technique we demonstrate gate-controlled switching of the charge state of individual tetrafluoro- tetracyanoquinodimethane (F4TCNQ) molecules at the surface of a graphene FET. We observe a non-rigid shift in the F4TCNQ lowest unoccupied molecular orbital (LUMO) energy relative to the Dirac point as a function of gate voltage. This can be explained by gate-tunable graphene polarization effects that renormalize the molecular quasiparticle energies. 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.
Issue Date: 25-Nov-2017
Date of Acceptance: 14-Oct-2016
URI: http://hdl.handle.net/10044/1/42192
DOI: https://dx.doi.org/10.1038/ncomms13553
ISSN: 2041-1723
Publisher: Nature Publishing Group: Nature Communications
Journal / Book Title: Nature Communications
Volume: 7
Copyright Statement: © The Author(s) 2016. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/N005244/1
Keywords: MD Multidisciplinary
Publication Status: Published
Article Number: 13553
Appears in Collections:Materials
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