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Realization of a two-dimensional Weyl semimetal and topological Fermi strings

Author

Listed:
  • Qiangsheng Lu

    (University of Missouri
    Oak Ridge National Laboratory)

  • P. V. Sreenivasa Reddy

    (National Cheng Kung University)

  • Hoyeon Jeon

    (Oak Ridge National Laboratory)

  • Alessandro R. Mazza

    (Oak Ridge National Laboratory
    Los Alamos National Laboratory)

  • Matthew Brahlek

    (Oak Ridge National Laboratory)

  • Weikang Wu

    (Singapore University of Technology and Design)

  • Shengyuan A. Yang

    (Singapore University of Technology and Design)

  • Jacob Cook

    (University of Missouri)

  • Clayton Conner

    (University of Missouri)

  • Xiaoqian Zhang

    (University of Missouri)

  • Amarnath Chakraborty

    (University of Missouri)

  • Yueh-Ting Yao

    (National Cheng Kung University)

  • Hung-Ju Tien

    (National Cheng Kung University)

  • Chun-Han Tseng

    (National Cheng Kung University)

  • Po-Yuan Yang

    (National Cheng Kung University)

  • Shang-Wei Lien

    (National Cheng Kung University)

  • Hsin Lin

    (Academia Sinica)

  • Tai-Chang Chiang

    (University of Illinois at Urbana-Champaign
    University of Illinois at Urbana-Champaign)

  • Giovanni Vignale

    (University of Missouri)

  • An-Ping Li

    (Oak Ridge National Laboratory)

  • Tay-Rong Chang

    (National Cheng Kung University
    Center for Quantum Frontiers of Research and Technology (QFort)
    National Center for Theoretical Sciences)

  • Rob G. Moore

    (Oak Ridge National Laboratory)

  • Guang Bian

    (University of Missouri
    University of Missouri)

Abstract

A two-dimensional (2D) Weyl semimetal, akin to a spinful variant of graphene, represents a topological matter characterized by Weyl fermion-like quasiparticles in low dimensions. The spinful linear band structure in two dimensions gives rise to distinctive topological properties, accompanied by the emergence of Fermi string edge states. We report the experimental realization of a 2D Weyl semimetal, bismuthene monolayer grown on SnS(Se) substrates. Using spin and angle-resolved photoemission and scanning tunneling spectroscopies, we directly observe spin-polarized Weyl cones, Weyl nodes, and Fermi strings, providing consistent evidence of their inherent topological characteristics. Our work opens the door for the experimental study of Weyl fermions in low-dimensional materials.

Suggested Citation

  • Qiangsheng Lu & P. V. Sreenivasa Reddy & Hoyeon Jeon & Alessandro R. Mazza & Matthew Brahlek & Weikang Wu & Shengyuan A. Yang & Jacob Cook & Clayton Conner & Xiaoqian Zhang & Amarnath Chakraborty & Yu, 2024. "Realization of a two-dimensional Weyl semimetal and topological Fermi strings," Nature Communications, Nature, vol. 15(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-50329-6
    DOI: 10.1038/s41467-024-50329-6
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    References listed on IDEAS

    as
    1. Alexey A. Soluyanov & Dominik Gresch & Zhijun Wang & QuanSheng Wu & Matthias Troyer & Xi Dai & B. Andrei Bernevig, 2015. "Type-II Weyl semimetals," Nature, Nature, vol. 527(7579), pages 495-498, November.
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