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Competing correlated states and abundant orbital magnetism in twisted monolayer-bilayer graphene

Author

Listed:
  • Minhao He

    (University of Washington)

  • Ya-Hui Zhang

    (Harvard University)

  • Yuhao Li

    (University of Washington)

  • Zaiyao Fei

    (University of Washington)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Xiaodong Xu

    (University of Washington
    University of Washington)

  • Matthew Yankowitz

    (University of Washington
    University of Washington)

Abstract

Flat band moiré superlattices have recently emerged as unique platforms for investigating the interplay between strong electronic correlations, nontrivial band topology, and multiple isospin ‘flavor’ symmetries. Twisted monolayer-bilayer graphene (tMBG) is an especially rich system owing to its low crystal symmetry and the tunability of its bandwidth and topology with an external electric field. Here, we find that orbital magnetism is abundant within the correlated phase diagram of tMBG, giving rise to the anomalous Hall effect in correlated metallic states nearby most odd integer fillings of the flat conduction band, as well as correlated Chern insulator states stabilized in an external magnetic field. The behavior of the states at zero field appears to be inconsistent with simple spin and valley polarization for the specific range of twist angles we investigate, and instead may plausibly result from an intervalley coherent (IVC) state with an order parameter that breaks time reversal symmetry. The application of a magnetic field further tunes the competition between correlated states, in some cases driving first-order topological phase transitions. Our results underscore the rich interplay between closely competing correlated ground states in tMBG, with possible implications for probing exotic IVC ordering.

Suggested Citation

  • Minhao He & Ya-Hui Zhang & Yuhao Li & Zaiyao Fei & Kenji Watanabe & Takashi Taniguchi & Xiaodong Xu & Matthew Yankowitz, 2021. "Competing correlated states and abundant orbital magnetism in twisted monolayer-bilayer graphene," Nature Communications, Nature, vol. 12(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-25044-1
    DOI: 10.1038/s41467-021-25044-1
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    Cited by:

    1. J. Díez-Mérida & A. Díez-Carlón & S. Y. Yang & Y.-M. Xie & X.-J. Gao & J. Senior & K. Watanabe & T. Taniguchi & X. Lu & A. P. Higginbotham & K. T. Law & Dmitri K. Efetov, 2023. "Symmetry-broken Josephson junctions and superconducting diodes in magic-angle twisted bilayer graphene," Nature Communications, Nature, vol. 14(1), pages 1-7, December.
    2. Saisab Bhowmik & Bhaskar Ghawri & Youngju Park & Dongkyu Lee & Suvronil Datta & Radhika Soni & K. Watanabe & T. Taniguchi & Arindam Ghosh & Jeil Jung & U. Chandni, 2023. "Spin-orbit coupling-enhanced valley ordering of malleable bands in twisted bilayer graphene on WSe2," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    3. Wenqiang Zhou & Jing Ding & Jiannan Hua & Le Zhang & Kenji Watanabe & Takashi Taniguchi & Wei Zhu & Shuigang Xu, 2024. "Layer-polarized ferromagnetism in rhombohedral multilayer graphene," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    4. Hongyun Zhang & Qian Li & Youngju Park & Yujin Jia & Wanying Chen & Jiaheng Li & Qinxin Liu & Changhua Bao & Nicolas Leconte & Shaohua Zhou & Yuan Wang & Kenji Watanabe & Takashi Taniguchi & Jose Avil, 2024. "Observation of dichotomic field-tunable electronic structure in twisted monolayer-bilayer graphene," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    5. Canxun Zhang & Tiancong Zhu & Tomohiro Soejima & Salman Kahn & Kenji Watanabe & Takashi Taniguchi & Alex Zettl & Feng Wang & Michael P. Zaletel & Michael F. Crommie, 2023. "Local spectroscopy of a gate-switchable moiré quantum anomalous Hall insulator," Nature Communications, Nature, vol. 14(1), pages 1-7, December.

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