Nanoscale Time-resolved Spectroscopy of Electrically Gated Graphene Nanoribbons

ORAL

Abstract

Graphene nanoribbons (GNRs) have shown many interesting electrical and optical properties. We have developed a novel optical spectrometer capable of probing the nonlinear optical response of nanoparticles with dimensions ~10 nm or less, over a wide range of frequencies[1]. The experiments take advantage of strong nonlinearities in SrTiO3 and the ability to “write” conductive nanowires at the LaAlO3/SrTiO3 (LAO/STO) interface with ~10 nm gaps that are co-located with a GNR. We will probe GNRs individually under the influence of large electric fields (~1 MV/cm) with various geometries of electric gates that are both static and dynamic to open a bandgap in the GNR and create a single electron state hosted in the GNR.



[1] L. Chen, et al., Light: Science & Appl. 8, 24 (2019).

* Funding acknowledgement: ONR GNR Qubit MURI. C.-B.E. acknowledges support from the Gordon and Betty Moore Foundation’s EPiQS Initiative (grant GBMF9065) and the Vannevar Bush Faculty Fellowship (ONR N00014-20-1-2844). Transport measurement at the University of Wisconsin–Madison was supported by the US Department of Energy (DOE), Office of Science, Office of Basic Energy Sciences (BES), under award number DE-FG02-06ER46327.

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Presenters

  • Melanie Dieterlen

    University of Pittsburgh

Authors

  • Melanie Dieterlen

    University of Pittsburgh

  • Pubudu G Wijesinghe

    University of Pittsburgh

  • Kyoungjun Lee

    University of Wisconsin-Madison, Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA, University of Wisconsin - Madison

  • Ki-Tae Eom

    University of Wisconsin Madison, University of Wisconsin - Madison

  • Chang-Beom Eom

    University of Wisconsin-Madison, Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA, University of wisconsin-madison, Department of Materials Science and Engineering, University of Wisconsin-Madison, Wisconsin 53706, USA

  • Alexander Sinitskii

    University of Nebraska - Lincoln

  • Patrick Irvin

    University of Pittsburgh, Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA

  • Jeremy Levy

    University of Pittsburgh, Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA

  • Mamun Sarker

    University of Nebraska-Lincoln, University of Nebraska - Lincoln