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

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.

SUBMITTER: Gehring P

PROVIDER: S-EPMC5492215 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature

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

Gehring Pascal P Sowa Jakub K JK Cremers Jonathan J Wu Qingqing Q Sadeghi Hatef H Sheng Yuewen Y Warner Jamie H JH Lambert Colin J CJ Briggs G Andrew D GAD Mol Jan A JA

ACS nano 20170421 6

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 ...[more]

PMID: 28423272

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