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

Author(s):

Pascal Gehring, Jakub K. Sowa, Jonathan Cremers, Qingqing Wu, Hatef Sadeghi, Yuewen Sheng, Jamie H. Warner, Colin J. Lambert, G. Andrew D. Briggs, Jan A. Mol

Journal:

ACS Nano

Year:

2017

Volume:

11

Pages

5325–5331

DOI:

10.1021/acsnano.7b00570

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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