Chern insulators, van Hove singularities and topological flat bands in magic-angle twisted bilayer graphene

• Published in: Nature materials Vol. 20; no. 4; pp. 488 - 494
• Main Authors: Wu, Shuang, Zhang, Zhenyuan, Watanabe, K., Taniguchi, T., Andrei, Eva Y.
• Format: Journal Article
• Language: English
• Published: London Nature Publishing Group UK 01.04.2021; Nature Publishing Group; Springer Nature - Nature Publishing Group
• Subjects: 639/766; 639/925; Bilayers; Biomaterials; Chemistry; Chemistry and Materials Science; Condensed Matter Physics; Graphene; High temperature; Insulators; Low temperature; Magnetic fields; Materials Science; Nanotechnology; Optical and Electronic Materials; Phase transitions; Physics; Plateaus; Singularities; Topology

Magic-angle twisted bilayer graphene exhibits intriguing quantum phase transitions triggered by enhanced electron–electron interactions when its flat bands are partially filled. However, the phases themselves and their connection to the putative non-trivial topology of the flat bands are largely une...