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

Zhang, Ya-Hui; Po, Hoi Chun; Senthil, T.

doi:10.1103/physrevb.100.125104

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

Journal Article · Tue Sep 03 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.100.125104· OSTI ID:1611146

^[1]; Po, Hoi Chun ^[1]; Senthil, T. ^[1]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

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.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0008739

OSTI ID:: 1611146

Alternate ID(s):: OSTI ID: 1560300

Journal Information:: Physical Review B, Vol. 100, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 36 works

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References (27)

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Electronic band structure and pinning of Fermi energy to van Hove singularities in twisted bilayer graphene: a self consistent approach Cea, Tommaso; Walet, Niels R.; Guinea, Francisco arXiv https://doi.org/10.48550/arxiv.1906.10570	text	January 2019

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