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A corner reflector of graphene Dirac fermions as a phonon-scattering sensor

Author

Listed:
  • H. Graef

    (Université Paris-Diderot
    Research Techno Plaza
    Nanyang Technological University)

  • Q. Wilmart

    (Université Paris-Diderot)

  • M. Rosticher

    (Université Paris-Diderot)

  • D. Mele

    (Université Paris-Diderot)

  • L. Banszerus

    (RWTH Aachen University)

  • C. Stampfer

    (RWTH Aachen University)

  • T. Taniguchi

    (National Institute for Materials Science)

  • K. Watanabe

    (National Institute for Materials Science)

  • J.-M. Berroir

    (Université Paris-Diderot)

  • E. Bocquillon

    (Université Paris-Diderot)

  • G. Fève

    (Université Paris-Diderot)

  • E. H. T. Teo

    (Nanyang Technological University
    Nanyang Technological University)

  • B. Plaçais

    (Université Paris-Diderot)

Abstract

Dirac fermion optics exploits the refraction of chiral fermions across optics-inspired Klein-tunneling barriers defined by high-transparency p-n junctions. We consider the corner reflector (CR) geometry introduced in optics or radars. We fabricate Dirac fermion CRs using bottom-gate-defined barriers in hBN-encapsulated graphene. By suppressing transmission upon multiple internal reflections, CRs are sensitive to minute phonon scattering rates. Here we report on doping-independent CR transmission in quantitative agreement with a simple scattering model including thermal phonon scattering. As a signature of CRs, we observe Fabry-Pérot oscillations at low temperature, consistent with single-path reflections. Finally, we demonstrate high-frequency operation which promotes CRs as fast phonon detectors. Our work establishes the relevance of Dirac fermion optics in graphene and opens a route for its implementation in topological Dirac matter.

Suggested Citation

  • H. Graef & Q. Wilmart & M. Rosticher & D. Mele & L. Banszerus & C. Stampfer & T. Taniguchi & K. Watanabe & J.-M. Berroir & E. Bocquillon & G. Fève & E. H. T. Teo & B. Plaçais, 2019. "A corner reflector of graphene Dirac fermions as a phonon-scattering sensor," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-10326-6
    DOI: 10.1038/s41467-019-10326-6
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