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, M. Zahid Hasan

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Article number3356
JournalNature communications
Volume11
Issue number1
DOIs
StatePublished - Dec 1 2020

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

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    Sanchez, D. S., Chang, G., Belopolski, I., Lu, H., Yin, J. X., Alidoust, N., Xu, X., Cochran, T. A., Zhang, X., Bian, Y., Zhang, S. S., Liu, Y. Y., Ma, J., Bian, G., Lin, H., Xu, S. Y., Jia, S., & Hasan, M. Z. (2020). Observation of Weyl fermions in a magnetic non-centrosymmetric crystal. Nature communications, 11(1), [3356]. https://doi.org/10.1038/s41467-020-16879-1