Nanoscale THz Spectroscopy of Electrically Gated Graphene Nanoribbons

ORAL

Abstract

Graphene nanoribbons (GNRs) have shown many interesting electrical and optical properties that are enabled by the bottom-up synthetic chemistry. 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 NIR [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 single GNR. We probe GNRs individually under the influence of large electric fields (~1 MV/cm) with various geometries of electric gates aligned parallel and perpendicular to the length of the GNR. The voltage-gated band structure changes are expected to play an important role in developing GNR-based spin qubits.

*JL acknowledges a Vannevar Bush Faculty Fellowship (ONR N00014-15-1-2847) and ONR MURI N00014-21-1-2437 . The research at U. Wisconsin-Madison is funded by the Gordon and Betty Moore Foundation’s EPiQS Initiative, grant GBMF9065 to C.B.E., Vannevar Bush Faculty Fellowship (ONR N00014-20-1-2844), and AFOSR (FA9550-15-1-0334).

–

Publication: [1] L. Chen, et al., Light: Science & Appl. 8, 24 (2019).
[2] E. Sheridan, Nano Letters (2020).
[3] M. Huang, et al., APL Materials 3, 062502 (2015).

Presenters

  • Melanie Dieterlen

    • University of Pittsburgh

Authors

  • Melanie Dieterlen

    • University of Pittsburgh

  • Erin Sheridan

    • University of Pittsburgh

  • Pubudu G Wijesinghe

    • University of Pittsburgh

  • Patrick Irvin

    • University of Pittsburgh

  • Jeremy Levy

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

  • Ki-Tae Eom

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

  • Chang-Beom Eom

    • University of Wisconsin - Madison
    • Oxide Laboratory, University of Wisconsin - Madison

  • Alexander Sinitskii

    • University of Nebraska - Lincoln
    • Department of Chemistry, University of Nebraska-Lincoln