• Letter

Kagome network of miniband-edge states in double-aligned graphene–hexagonal boron nitride structures

Christian Moulsdale, Angelika Knothe, and Vladimir Fal'ko
Phys. Rev. B 105, L201112 – Published 20 May 2022
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Abstract

Twistronic heterostructures have recently emerged as a new class of quantum electronic materials with properties determined by the twist angle between the adjacent two-dimensional materials. Here, we study moiré superlattice minibands in graphene (G) encapsulated in hexagonal boron nitride (hBN) with an almost perfect alignment with both the top and bottom hBN crystals. We show that, for such an orientation of the unit cells of the hBN layers that locally breaks inversion symmetry of the graphene lattice, the hBN/G/hBN structure features a kagome network of topologically protected states with energies near the miniband edge, propagating along the lines separating the areas with different miniband Chern numbers.

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  • Received 11 February 2022
  • Revised 26 April 2022
  • Accepted 2 May 2022

DOI:https://doi.org/10.1103/PhysRevB.105.L201112

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Christian Moulsdale1,2,*, Angelika Knothe2, and Vladimir Fal'ko1,2,3

  • 1School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
  • 2National Graphene Institute, University of Manchester, Manchester M13 9PL, United Kingdom
  • 3Henry Royce Institute, Institute for Advanced Materials, Manchester M13 9PL, United Kingdom

  • *christian.moulsdale@postgrad.manchester.ac.uk

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Issue

Vol. 105, Iss. 20 — 15 May 2022

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