Observation of Weyl fermions in a magnetic non-centrosymmetric crystal

ORAL

Abstract

Here we report on the topological electronic 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.

*Work at Princeton was supported by the US DOE under the Basic Energy Sciences programme (Grant #: DOE/BES DE-FG-02-05ER46200).

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Presenters

  • Daniel Sanchez

    • Princeton University

Authors

  • Daniel Sanchez

    • Princeton University

  • Guoqing Chang

    • Princeton University
    • Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University
    • Nanyang Technological University
    • Department of Physics, Princeton University

  • Ilya Belopolski

    • Princeton University
    • Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University
    • Department of Physics, Princeton University
    • Center for Emergent Matter Science, RIKEN

  • Hong Lu

    • School of Physics, Peking University
    • College of Engineering and Applied Sciences, Nanjing Univ
    • College of Engineering and Applied Sciences, Nanjing University
    • Nanjing Univ

  • Jiaxin Yin

    • Princeton University
    • Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University
    • Department of Physics, Princeton University

  • Nasser Alidoust

    • Princeton University

  • Xitong Xu

    • School of Physics, Peking University

  • Tyler Cochran

    • Princeton University
    • Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University
    • Department of Physics, Princeton University

  • Xiao Zhang

    • School of Physics, Peking University

  • Yi Bian

    • School of Physics, Peking University

  • Songtian Zhang

    • Princeton University
    • Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University
    • Department of Physics, Princeton University

  • Yi-Yuan Liu

    • School of Physics, Peking University

  • Jie Ma

    • School of Physics and Astronomy, Shanghai Jiao Tong University
    • Shanghai Jiao Tong University

  • Guang Bian

    • University of Missouri
    • Department of Physics and Astronomy, University of Missouri
    • Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211

  • Hsin Lin

    • Institute of Physics, Academia Sinica
    • Academia Sinica
    • Institute of Physics, Academia Sinica, Taipei
    • Institute of Physics, Academia Sinica, Taiwan
    • Physics, Academia Sinica

  • Suyang Xu

    • Department of Chemistry and Chemical Biology, Harvard University
    • Havard University
    • Harvard University

  • Shuang Jia

    • School of Physics, Peking University
    • International Center for Quantum Materials, Peking University
    • Peking University

  • Zahid Hasan

    • Princeton University
    • Laboratory for Topological Quantum Matter and Spectroscopy, Department of Physics, Princeton University