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Strong Interminivalley Scattering in Twisted Bilayer Graphene Revealed by High-Temperature Magneto-Oscillations

I. Y. Phinney, D. A. Bandurin, C. Collignon, I. A. Dmitriev, T. Taniguchi, K. Watanabe, and P. Jarillo-Herrero
Phys. Rev. Lett. 127, 056802 – Published 30 July 2021
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Abstract

Twisted bilayer graphene (TBG) provides an example of a system in which the interplay of interlayer interactions and superlattice structure impacts electron transport in a variety of nontrivial ways and gives rise to a plethora of interesting effects. Understanding the mechanisms of electron scattering in TBG has, however, proven challenging, raising many questions about the origins of resistivity in this system. Here we show that TBG exhibits high-temperature magneto-oscillations originating from the scattering of charge carriers between TBG minivalleys. The amplitude of these oscillations reveals that interminivalley scattering is strong, and its characteristic timescale is comparable to that of its intraminivalley counterpart. Furthermore, by exploring the temperature dependence of these oscillations, we estimate the electron-electron collision rate in TBG and find that it exceeds that of monolayer graphene. Our study demonstrates the consequences of the relatively small size of the superlattice Brillouin zone and Fermi velocity reduction on lateral transport in TBG.

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  • Received 14 April 2021
  • Accepted 29 June 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.056802

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

I. Y. Phinney1, D. A. Bandurin1,*, C. Collignon1, I. A. Dmitriev2,3, T. Taniguchi4, K. Watanabe5, and P. Jarillo-Herrero1,†

  • 1Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
  • 2Physics Department, University of Regensburg, 93040, Regensburg, Germany
  • 3Ioffe Institute, 194021 St. Petersburg, Russia
  • 4International Center for Materials Nanoarchitectonics, National Institute of Material Science, Tsukuba 305-0044, Japan
  • 5Research Center for Functional Materials, National Institute of Material Science, Tsukuba 305-0044, Japan

  • *bandurin@mit.edu
  • pjarillo@mit.edu

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Issue

Vol. 127, Iss. 5 — 30 July 2021

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