Landau level degeneracy in twisted bilayer graphene: Role of symmetry breaking
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 ≈1.05°. 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 C3-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. Here, motivated by recent experiments, we further consider the effect of C2-symmetry breaking on the Landau levels.
- Publication Date:
- Research Org.:
- Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1611146
- Alternate Identifier(s):
- OSTI ID: 1560300
- Grant/Contract Number:
- SC0008739
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 100; Journal Issue: 12; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Materials science; Physics; Continuum mechanics; Landau levels; Bilayer films; Graphene
Citation Formats
Zhang, Ya-Hui, Po, Hoi Chun, and Senthil, T. Landau level degeneracy in twisted bilayer graphene: Role of symmetry breaking. United States: N. p., 2019.
Web. doi:10.1103/physrevb.100.125104.
Zhang, Ya-Hui, Po, Hoi Chun, & Senthil, T. Landau level degeneracy in twisted bilayer graphene: Role of symmetry breaking. United States. https://doi.org/10.1103/physrevb.100.125104
Zhang, Ya-Hui, Po, Hoi Chun, and Senthil, T. Tue .
"Landau level degeneracy in twisted bilayer graphene: Role of symmetry breaking". United States. https://doi.org/10.1103/physrevb.100.125104. https://www.osti.gov/servlets/purl/1611146.
@article{osti_1611146,
title = {Landau level degeneracy in twisted bilayer graphene: Role of symmetry breaking},
author = {Zhang, Ya-Hui and Po, Hoi Chun and Senthil, T.},
abstractNote = {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 ≈1.05°. 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 C3-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. Here, motivated by recent experiments, we further consider the effect of C2-symmetry breaking on the Landau levels.},
doi = {10.1103/physrevb.100.125104},
journal = {Physical Review B},
number = 12,
volume = 100,
place = {United States},
year = {Tue Sep 03 00:00:00 EDT 2019},
month = {Tue Sep 03 00:00:00 EDT 2019}
}
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Works referenced in this record:
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text, January 2011
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Identification of superconducting pairing symmetry in twisted bilayer graphene using in-plane magnetic field and strain
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Works referencing / citing this record:
Electronic band structure and pinning of Fermi energy to van Hove singularities in twisted bilayer graphene: a self consistent approach
text, January 2019
- Cea, Tommaso; Walet, Niels R.; Guinea, Francisco
- arXiv