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A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling

Author

Listed:
  • Chaowei Hu

    (University of California)

  • Kyle N. Gordon

    (University of Colorado)

  • Pengfei Liu

    (Southern University of Science and Technology)

  • Jinyu Liu

    (University of California)

  • Xiaoqing Zhou

    (University of Colorado)

  • Peipei Hao

    (University of Colorado)

  • Dushyant Narayan

    (University of Colorado)

  • Eve Emmanouilidou

    (University of California)

  • Hongyi Sun

    (Southern University of Science and Technology)

  • Yuntian Liu

    (Southern University of Science and Technology)

  • Harlan Brawer

    (University of California)

  • Arthur P. Ramirez

    (University of California)

  • Lei Ding

    (Oak Ridge National Laboratory)

  • Huibo Cao

    (Oak Ridge National Laboratory)

  • Qihang Liu

    (Southern University of Science and Technology
    Southern University of Science and Technology)

  • Dan Dessau

    (University of Colorado
    University of Colorado)

  • Ni Ni

    (University of California)

Abstract

Magnetic topological insulators (TI) provide an important material platform to explore quantum phenomena such as quantized anomalous Hall effect and Majorana modes, etc. Their successful material realization is thus essential for our fundamental understanding and potential technical revolutions. By realizing a bulk van der Waals material MnBi4Te7 with alternating septuple [MnBi2Te4] and quintuple [Bi2Te3] layers, we show that it is ferromagnetic in plane but antiferromagnetic along the c axis with an out-of-plane saturation field of ~0.22 T at 2 K. Our angle-resolved photoemission spectroscopy measurements and first-principles calculations further demonstrate that MnBi4Te7 is a Z2 antiferromagnetic TI with two types of surface states associated with the [MnBi2Te4] or [Bi2Te3] termination, respectively. Additionally, its superlattice nature may make various heterostructures of [MnBi2Te4] and [Bi2Te3] layers possible by exfoliation. Therefore, the low saturation field and the superlattice nature of MnBi4Te7 make it an ideal system to investigate rich emergent phenomena.

Suggested Citation

  • Chaowei Hu & Kyle N. Gordon & Pengfei Liu & Jinyu Liu & Xiaoqing Zhou & Peipei Hao & Dushyant Narayan & Eve Emmanouilidou & Hongyi Sun & Yuntian Liu & Harlan Brawer & Arthur P. Ramirez & Lei Ding & Hu, 2020. "A van der Waals antiferromagnetic topological insulator with weak interlayer magnetic coupling," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-019-13814-x
    DOI: 10.1038/s41467-019-13814-x
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    Cited by:

    1. Su Kong Chong & Yang Cheng & Huiyuan Man & Seng Huat Lee & Yu Wang & Bingqian Dai & Masaki Tanabe & Ting-Hsun Yang & Zhiqiang Mao & Kathryn A. Moler & Kang L. Wang, 2024. "Intrinsic exchange biased anomalous Hall effect in an uncompensated antiferromagnet MnBi2Te4," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. David Lujan & Jeongheon Choe & Martin Rodriguez-Vega & Zhipeng Ye & Aritz Leonardo & T. Nathan Nunley & Liang-Juan Chang & Shang-Fan Lee & Jiaqiang Yan & Gregory A. Fiete & Rui He & Xiaoqin Li, 2022. "Magnons and magnetic fluctuations in atomically thin MnBi2Te4," Nature Communications, Nature, vol. 13(1), pages 1-7, December.
    3. Xinyu Huang & Luman Zhang & Lei Tong & Zheng Li & Zhuiri Peng & Runfeng Lin & Wenhao Shi & Kan-Hao Xue & Hongwei Dai & Hui Cheng & Danilo de Camargo Branco & Jianbin Xu & Junbo Han & Gary J. Cheng & X, 2023. "Manipulating exchange bias in 2D magnetic heterojunction for high-performance robust memory applications," Nature Communications, Nature, vol. 14(1), pages 1-10, December.

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