Higher-Order Topological Insulator in Twisted Bilayer Graphene

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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.
Publisher
AMER PHYSICAL SOC
Issue Date
2019-11
Language
English
Article Type
Article
Citation

PHYSICAL REVIEW LETTERS, v.123, no.21, pp.216803

ISSN
0031-9007
DOI
10.1103/PhysRevLett.123.216803
URI
http://hdl.handle.net/10203/269764
Appears in Collection
PH-Journal Papers(저널논문)
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