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Edge photocurrent driven by terahertz electric field in bilayer graphene

S. Candussio, M. V. Durnev, S. A. Tarasenko, J. Yin, J. Keil, Y. Yang, S.-K. Son, A. Mishchenko, H. Plank, V. V. Bel'kov, S. Slizovskiy, V. Fal'ko, and S. D. Ganichev
Phys. Rev. B 102, 045406 – Published 6 July 2020

Abstract

We report on the observation of edge electric currents excited in bilayer graphene by terahertz laser radiation. We show that the current generation belongs to the class of second order in electric field phenomena and is controlled by the orientation of the THz electric field polarization plane. Additionally, applying a small magnetic field normal to the graphene plane leads to a phase shift in the polarization dependence. With increasing the magnetic field strength, the current starts to exhibit 1/B-magneto-oscillations with a period consistent with that of the Shubnikov–de Haas effect and amplitude by an order of magnitude larger as compared to the current at zero magnetic field measured under the same conditions. The microscopic theory developed shows that the current is formed in the edge's vicinity limited by the mean-free path of carriers and the screening length of the high-frequency electric field. The current originates from the alignment of the free carrier momenta and dynamic accumulation of charge at the edges, where the P-symmetry is naturally broken. The observed magneto-oscillations of the photocurrent are attributed to the formation of Landau levels.

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  • Received 4 May 2020
  • Revised 15 June 2020
  • Accepted 16 June 2020

DOI:https://doi.org/10.1103/PhysRevB.102.045406

©2020 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. Candussio1, M. V. Durnev2, S. A. Tarasenko2, J. Yin3, J. Keil1, Y. Yang3, S.-K. Son4, A. Mishchenko3, H. Plank1, V. V. Bel'kov2, S. Slizovskiy3,5,6, V. Fal'ko3,5,7, and S. D. Ganichev1

  • 1Terahertz Center, University of Regensburg, 93040 Regensburg, Germany
  • 2Ioffe Institute, 194021 St. Petersburg, Russia
  • 3Department of Physics & Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
  • 4Department of Physics, Mokpo National University, Muan, Jeollanam-do 58554, Republic of Korea
  • 5National Graphene Institute, University of Manchester, Manchester M13 9PL, United Kingdom
  • 6St. Petersburg INP, Gatchina, 188300 St. Petersburg, Russia
  • 7Henry Royce Institute for Advanced Materials, Manchester M13 9PL, United Kingdom

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Issue

Vol. 102, Iss. 4 — 15 July 2020

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