Landau level degeneracy in twisted bilayer graphene: Role of symmetry breaking
Name
PhysRevB.100.125104.pdf
Size
3.24 MB
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Adobe PDF
Checksum (MD5)
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Author(s)
Zhang, Ya-Hui
Po, Hoi Chun
Todadri, Senthil
Date Issued
September 2019
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
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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.100.125104
