Nanoscale THz 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 in THz and near-infrared [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.



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

*JL acknowledges support from ONR N00014-20-1-2481. JL and PI acknowledge support from DOE-QIS. The research is funded in part by the Gordon and Betty Moore Foundation’s EPiQS Initiative, grant GBMF9065 to C.B.E. and Vannevar Bush Faculty Fellowship (ONR N00014-20-1-2844).

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Presenters

  • Melanie Dieterlen

    • University of Pittsburgh

Authors

  • Melanie Dieterlen

    • University of Pittsburgh

  • Erin C Sheridan

    • University of Pittsburgh
    • US Air Force Research Laboratory

  • Pubudu G Wijesinghe

    • University of Pittsburgh

  • Ki-Tae Eom

    • University of Wisconsin Madison
    • University of Wisconsin - Madison
    • University of Wisconsin-Madison

  • Chang-Beom Eom

    • University of Wisconsin - Madison

  • Jeremy Levy

    • University of Pittsburgh
    • Department of Physics and Astronomy, University of Pittsburgh