Article Broken-Symmetry Quantum Hall States in Twisted Bilayer Graphene

Youngwook Kim ; Jaesung Park ; Intek Song ; Jong Mok Ok ; Younjung Jo ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials Science) ; Takashi Taniquchi SAMURAI ORCID ; Hee Cheul Choi ; Dong Su Lee ; Suyong Jung ; Jun Sung Kim

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Youngwook Kim, Jaesung Park, Intek Song, Jong Mok Ok, Younjung Jo, Kenji Watanabe, Takashi Taniquchi, Hee Cheul Choi, Dong Su Lee, Suyong Jung, Jun Sung Kim. Broken-Symmetry Quantum Hall States in Twisted Bilayer Graphene. Scientific Reports. 2016, 6 (1), 38068. https://doi.org/10.1038/srep38068
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(abstract)

We have investigated broken-symmetry quantum Hall (QH) states and their transitions with the interplay of the relative strength of valley, spin and layer polarizations in twisted bilayer graphene. The energy gaps for the low energy broken-symmetry QH states show an electron-hole asymmetric behaviour but with an opposite polarity for even and odd filling factor states. These results strongly suggest that the QH states with broken valley and spin symmetries for individual layer become hybridized via interlayer tunnelling and the hierarchy of QH states is sensitive to both magnetic field and displacement field due to charge imbalance between layers.

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Keyword: Twisted bilayer graphene, quantum Hall effect, spin symmetry

Date published: 2016-12-01

Publisher: Springer Science and Business Media LLC

Journal:

  • Scientific Reports (ISSN: 20452322) vol. 6 issue. 1 38068

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Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.1038/srep38068

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Updated at: 2025-02-28 16:31:03 +0900

Published on MDR: 2025-02-28 16:31:03 +0900

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