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Landau level degeneracy in twisted bilayer graphene: Role of symmetry breaking

Author(s)
Zhang, Ya-Hui; Po, Hoi Chun; Todadri, Senthil
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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Abstract
The degeneracy of Landau levels flanking charge neutrality in twisted bilayer graphene is known to change from eightfold to fourfold when the twist angle is reduced to values near the magic angle of ≈1.05º. This degeneracy lifting has been reproduced in experiments by multiple groups and is known to occur even in devices which do not harbor the correlated insulators and superconductors. We propose C[subscript 3]-symmetry breaking as an explanation of such robust degeneracy lifting and support our proposal by numerical results on the Landau-level spectrum in near-magic-angle twisted bilayer graphene. Motivated by recent experiments, we further consider the effect of C[subscript 2]-symmetry breaking on the Landau levels.
Date issued
2019-09
URI
https://hdl.handle.net/1721.1/125036
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Physical Review B
Publisher
American Physical Society
Citation
Zhang, Ya-Hui, et al. “Landau Level Degeneracy in Twisted Bilayer Graphene: Role of Symmetry Breaking.” Physical Review B 100, 12 (September 2019): 125104. © 2019 American Physical Society
Version: Final published version
ISSN
2469-9950
2469-9969

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