Observation of Weyl fermions in a magnetic non-centrosymmetric crystal

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 Bian, Hsin Lin, Su-Yang Xu, Shuang Jia and M. Zahid Hasan ()
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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
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
M. Zahid Hasan: Princeton University

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-16879-1

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