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Higher-Order Topological Insulator in Twisted Bilayer Graphene

Moon Jip Park, Youngkuk Kim, Gil Young Cho, and SungBin Lee
Phys. Rev. Lett. 123, 216803 – Published 22 November 2019
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Abstract

Higher-order topological insulators are newly proposed topological phases of matter, whose bulk topology manifests as localized modes at two- or higher-dimensional lower boundaries. In this Letter, we propose the twisted bilayer graphenes with large angles as higher-order topological insulators, hosting topological corner charges. At large commensurate angles, the intervalley scattering opens up the bulk gap and the corner states occur at half filling. Based on both first-principles calculations and analytic analysis, we show the striking results that the emergence of the corner states do not depend on the choice of the specific angles as long as the underlying symmetries are intact. Our results show that the twisted bilayer graphene can serve as a robust candidate material of a two-dimensional higher-order topological insulator.

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  • Received 10 July 2019

DOI:https://doi.org/10.1103/PhysRevLett.123.216803

© 2019 American Physical Society

Physics Subject Headings (PhySH)

  1. Physical Systems
Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Moon Jip Park1,*, Youngkuk Kim2,†, Gil Young Cho3,‡, and SungBin Lee1,§

  • 1Department of Physics, KAIST, Daejeon 34141, Republic of Korea
  • 2Department of Physics, Sungkyunkwan University, Suwon 16419, Republic of Korea
  • 3Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea

  • *moonjippark@kaist.ac.kr
  • youngkuk@skku.edu
  • gilyoungcho@postech.ac.kr
  • §sungbin@kaist.ac.kr

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Issue

Vol. 123, Iss. 21 — 22 November 2019

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