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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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.