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Observation of Weyl fermions in a magnetic non-centrosymmetric crystal

Author

Listed:
  • Daniel S. Sanchez

    (Princeton University)

  • Guoqing Chang

    (Princeton University)

  • Ilya Belopolski

    (Princeton University)

  • Hong Lu

    (School of Physics, Peking University)

  • Jia-Xin Yin

    (Princeton University)

  • Nasser Alidoust

    (Princeton University
    Rigetti Computing)

  • Xitong Xu

    (School of Physics, Peking University)

  • Tyler A. Cochran

    (Princeton University)

  • Xiao Zhang

    (School of Physics, Peking University)

  • Yi Bian

    (School of Physics, Peking University)

  • Songtian S. Zhang

    (Princeton University)

  • Yi-Yuan Liu

    (School of Physics, Peking University)

  • Jie Ma

    (School of Physics and Astronomy, Shanghai Jiao Tong University)

  • Guang Bian

    (University of Missouri)

  • Hsin Lin

    (Institute of Physics, Academia Sinica)

  • Su-Yang Xu

    (Princeton University)

  • Shuang Jia

    (School of Physics, Peking University
    Collaborative Innovation Center of Quantum Matter)

  • M. Zahid Hasan

    (Princeton University
    Princeton University
    Lawrence Berkeley National Laboratory)

Abstract

The absence of inversion symmetry in non-centrosymmetric materials has a fundamental role in the emergence of a vast number of fascinating phenomena, like ferroelectricity, second harmonic generation, and Weyl fermions. The removal of time-reversal symmetry in such systems further extends the variety of observable magneto-electric and topological effects. Here we report the striking topological properties in the non-centrosymmetric spin-orbit magnet PrAlGe by combining spectroscopy and transport measurements. By photoemission spectroscopy below the Curie temperature, we observe topological Fermi arcs that correspond to projected topological charges of ±1 in the surface Brillouin zone. In the bulk, we observe the linear energy-dispersion of the Weyl fermions. We further observe a large anomalous Hall response in our magneto-transport measurements, which is understood to arise from diverging bulk Berry curvature fields associated with the Weyl band structure. These results establish a novel Weyl semimetal phase in magnetic non-centrosymmetric PrAlGe.

Suggested Citation

  • Daniel S. Sanchez & Guoqing Chang & Ilya Belopolski & Hong Lu & Jia-Xin Yin & Nasser Alidoust & Xitong Xu & Tyler A. Cochran & Xiao Zhang & Yi Bian & Songtian S. Zhang & Yi-Yuan Liu & Jie Ma & Guang B, 2020. "Observation of Weyl fermions in a magnetic non-centrosymmetric crystal," Nature Communications, Nature, vol. 11(1), pages 1-8, December.
  • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-16879-1
    DOI: 10.1038/s41467-020-16879-1
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    Cited by:

    1. Erjian Cheng & Limin Yan & Xianbiao Shi & Rui Lou & Alexander Fedorov & Mahdi Behnami & Jian Yuan & Pengtao Yang & Bosen Wang & Jin-Guang Cheng & Yuanji Xu & Yang Xu & Wei Xia & Nikolai Pavlovskii & D, 2024. "Tunable positions of Weyl nodes via magnetism and pressure in the ferromagnetic Weyl semimetal CeAlSi," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    2. Nathan C. Drucker & Thanh Nguyen & Fei Han & Phum Siriviboon & Xi Luo & Nina Andrejevic & Ziming Zhu & Grigory Bednik & Quynh T. Nguyen & Zhantao Chen & Linh K. Nguyen & Tongtong Liu & Travis J. Willi, 2023. "Topology stabilized fluctuations in a magnetic nodal semimetal," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    3. Cong Li & Jianfeng Zhang & Yang Wang & Hongxiong Liu & Qinda Guo & Emile Rienks & Wanyu Chen & Francois Bertran & Huancheng Yang & Dibya Phuyal & Hanna Fedderwitz & Balasubramanian Thiagarajan & Macie, 2023. "Emergence of Weyl fermions by ferrimagnetism in a noncentrosymmetric magnetic Weyl semimetal," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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