Multiple flat bands and topological Hofstadter butterfly in twisted bilayer graphene close to the second magic angle
Abstract
Multiple flat bands in high-quality twisted bilayer graphene close to the theoretically predicted second magic angle are observed. These well-isolated flat moiré bands host a nontrivial topology which is evidenced by a connecting multiband Hofstadter butterfly spectrum. This work provides a perspective for understanding the emergent quantum phases (i.e., strong correlation and band topology) in twisted bilayer graphene and the fractal Hofstadter spectra of multiple topological bands.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jul 23, 2021
- Source ID
- 10.1073/pnas.2100006118
Entities
People
- Allan H. MacDonald
- Andrei Bernevig
- B. A. Piot
- Biao Lian
- Dmitri K. Efetov
- Gaurav Chaudhary
- Giulio Romagnoli
- Kenji Watanabe
- Martino Poggio
- Takashi Taniguchi
- Xiaobo Lu
Organizations
- Barcelona Institute for Science and Technology
- Consejería de Economía y Hacienda
- Generalitat of Catalonia
- Grenoble Alpes University
- National Institute for Materials Science
- Office of Basic Energy Sciences
- Office of Naval Research Global
- Princeton University
- Simons Foundation
- Swiss National Science Foundation
- University of Basel
- University of Texas at Austin