Distinguishing lead and molecule states in graphene-based single-electron transistors

Gehring, Pascal;Sowa, J.K.;Cremers, J.;et.al.
(2017) ACS Nano — Vol. 11, n° 6, p. 5325-5331 (2017)

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  • Gehring, Pascalorcid-logoUCLouvain
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  • Sowa, J.K.Department of Materials, University of Oxford
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  • Cremers, J.Department of Chemistry, University of Oxford
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  • et. al.
Abstract
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.
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Gehring, P., Sowa, J. K., Cremers, J., & et al. (2017). Distinguishing lead and molecule states in graphene-based single-electron transistors. ACS Nano, 11(6), 5325-5331. https://doi.org/10.1021/acsnano.7b00570 (Original work published 2017)