Kagomé network of chiral miniband-edge states in double-aligned graphene-hexagonal boron nitride structures
arXiv:2202.06667 · doi:10.1103/PhysRevB.105.L201112
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 Kagomé network of topologically protected chiral states with energies near the miniband edge, propagating along the lines separating the areas with different miniband Chern numbers.
6 pages, 3 figures (Supplemental Material: 7 pages, 5 figures, 1 table)
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Cited by in corpus (9)
- Theory of fractional Chern insulator states in pentalayer graphene moiré superlattice
- Topological Flat Bands in Graphene Super-moiré Lattices
- Network model for periodically strained graphene
- Adhesion and Reconstruction of Graphene/Hexagonal Boron Nitride Heterostructures: A Quantum Monte Carlo Study
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