Distinguishing Lead and Molecule States in Graphene-Based Single-Electron Transistors

Gehring, Pascal and Sowa, Jakub K. and Cremers, Jonathan and Wu, Qingqing and Sadeghi, Hatef and Sheng, Yuewen and Warner, Jamie H. and Lambert, Colin J. and Briggs, G. Andrew D. and Mol, Jan A. (2017) Distinguishing Lead and Molecule States in Graphene-Based Single-Electron Transistors. ACS Nano, 11 (6). pp. 5325-5331. ISSN 1936-0851

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Graphene provides a two-dimensional platform for contacting individual molecules, which enables transport spectroscopy of molecular orbital, spin, and vibrational states. Here we report single-electron tunneling through a molecule that has been anchored to two graphene leads. Quantum interference within the graphene leads gives rise to an energy-dependent transmission and fluctuations in the sequential tunnel-rates. The lead states are electrostatically tuned by a global back-gate, resulting in a distinct pattern of varying intensity in the measured conductance maps. This pattern could potentially obscure transport features that are intrinsic to the molecule under investigation. Using ensemble averaged magneto-conductance measurements, lead and molecule states are disentangled, enabling spectroscopic investigation of the single molecule.

Item Type:
Journal Article
Journal or Publication Title:
ACS Nano
Additional Information:
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Nano, copyright © 2017American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/acsnano.7b00570
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05 Jun 2017 08:02
Last Modified:
03 May 2024 23:56