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Evidence for one-dimensional chiral edge states in a magnetic Weyl semimetal Co3Sn2S2

Author

Listed:
  • Sean Howard

    (University of Illinois Urbana-Champaign)

  • Lin Jiao

    (University of Illinois Urbana-Champaign)

  • Zhenyu Wang

    (University of Illinois Urbana-Champaign)

  • Noam Morali

    (Weizmann Institute of Science)

  • Rajib Batabyal

    (Weizmann Institute of Science)

  • Pranab Kumar-Nag

    (Weizmann Institute of Science)

  • Nurit Avraham

    (Weizmann Institute of Science)

  • Haim Beidenkopf

    (Weizmann Institute of Science)

  • Praveen Vir

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Enke Liu

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Chandra Shekhar

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Claudia Felser

    (Max-Planck-Institute for Chemical Physics of Solids)

  • Taylor Hughes

    (University of Illinois at, Urbana-Champaign)

  • Vidya Madhavan

    (University of Illinois Urbana-Champaign)

Abstract

The physical realization of Chern insulators is of fundamental and practical interest, as they are predicted to host the quantum anomalous Hall (QAH) effect and topologically protected chiral edge states which can carry dissipationless current. Current realizations of the QAH state often require complex heterostructures and sub-Kelvin temperatures, making the discovery of intrinsic, high temperature QAH systems of significant interest. In this work we show that time-reversal symmetry breaking Weyl semimetals, being essentially stacks of Chern insulators with inter-layer coupling, may provide a new platform for the higher temperature realization of robust chiral edge states. We present combined scanning tunneling spectroscopy and theoretical investigations of the magnetic Weyl semimetal, Co3Sn2S2. Using modeling and numerical simulations we find that depending on the strength of the interlayer coupling, chiral edge states can be localized on partially exposed kagome planes on the surfaces of a Weyl semimetal. Correspondingly, our dI/dV maps on the kagome Co3Sn terraces show topological states confined to the edges which display linear dispersion. This work provides a new paradigm for realizing chiral edge modes and provides a pathway for the realization of higher temperature QAH effect in magnetic Weyl systems in the two-dimensional limit.

Suggested Citation

  • Sean Howard & Lin Jiao & Zhenyu Wang & Noam Morali & Rajib Batabyal & Pranab Kumar-Nag & Nurit Avraham & Haim Beidenkopf & Praveen Vir & Enke Liu & Chandra Shekhar & Claudia Felser & Taylor Hughes & V, 2021. "Evidence for one-dimensional chiral edge states in a magnetic Weyl semimetal Co3Sn2S2," Nature Communications, Nature, vol. 12(1), pages 1-7, December.
  • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-24561-3
    DOI: 10.1038/s41467-021-24561-3
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    Cited by:

    1. Xianyang Lu & Zhiyong Lin & Hanqi Pi & Tan Zhang & Guanqi Li & Yuting Gong & Yu Yan & Xuezhong Ruan & Yao Li & Hui Zhang & Lin Li & Liang He & Jing Wu & Rong Zhang & Hongming Weng & Changgan Zeng & Yo, 2024. "Ultrafast magnetization enhancement via the dynamic spin-filter effect of type-II Weyl nodes in a kagome ferromagnet," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    2. Dmitry Ovchinnikov & Jiaqi Cai & Zhong Lin & Zaiyao Fei & Zhaoyu Liu & Yong-Tao Cui & David H. Cobden & Jiun-Haw Chu & Cui-Zu Chang & Di Xiao & Jiaqiang Yan & Xiaodong Xu, 2022. "Topological current divider in a Chern insulator junction," Nature Communications, Nature, vol. 13(1), pages 1-6, December.
    3. Hui Chen & Yuqing Xing & Hengxin Tan & Li Huang & Qi Zheng & Zihao Huang & Xianghe Han & Bin Hu & Yuhan Ye & Yan Li & Yao Xiao & Hechang Lei & Xianggang Qiu & Enke Liu & Haitao Yang & Ziqiang Wang & B, 2024. "Atomically precise engineering of spin–orbit polarons in a kagome magnetic Weyl semimetal," Nature Communications, Nature, vol. 15(1), pages 1-8, December.

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