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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.

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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