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

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 and B. Plaçais ()
Additional contact information
H. Graef: Université Paris-Diderot
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
B. Plaçais: Université Paris-Diderot

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: 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.

Date: 2019
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DOI: 10.1038/s41467-019-10326-6

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