Observation of a flat band and bandgap in millimeter-scale twisted bilayer graphene
Name
s43246-021-00221-3.pdf
Size
3.58 MB
Format
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Checksum (MD5)
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Author(s)
Sato, Keiju
Hayashi, Naoki
Ito, Takahiro
Masago, Noriyuki
Takamura, Makoto
Morimoto, Mitsuru
Maekawa, Takuji
Lee, Doyoon
Qiao, Kuan
Kim, Jeehwan
Date Issued
December 14, 2021
Journal
Communications Materials
Publisher
Springer Science and Business Media LLC
Citation
Sato, K., Hayashi, N., Ito, T. et al. Observation of a flat band and bandgap in millimeter-scale twisted bilayer graphene. Commun Mater 2, 117 (2021).
Version
Final published version
Abstract
Magic-angle twisted bilayer graphene, consisting of two graphene layers stacked at a special angle, exhibits superconductivity due to the maximized density of states at the energy of the flat band. Generally, experiments on twisted bilayer graphene have been performed using micrometer-scale samples. Here we report the fabrication of twisted bilayer graphene with an area exceeding 3 × 5 mm2 by transferring epitaxial graphene onto another epitaxial graphene, and observation of a flat band and large bandgap using angle-resolved photoemission spectroscopy. Our results suggest that the substrate potential induces both the asymmetrical doping in large angle twisted bilayer graphene and the electron doped nature of the flat band in magic-angle twisted bilayer graphene.
Subjects
Mechanics of Materials
General Materials Science
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Creative Commons Attribution
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1038/s43246-021-00221-3
