@article{0170cf38484a4e59bcfa117799c6dcab,
title = "Observation of Weyl fermions in a magnetic non-centrosymmetric crystal",
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.",
author = "Sanchez, {Daniel S.} and Guoqing Chang and Ilya Belopolski and Hong Lu and Yin, {Jia Xin} and Nasser Alidoust and Xitong Xu and Cochran, {Tyler A.} and Xiao Zhang and Yi Bian and Zhang, {Songtian S.} and Liu, {Yi Yuan} and Jie Ma and Guang Bian and Hsin Lin and Xu, {Su Yang} and Shuang Jia and Hasan, {M. Zahid}",
note = "Funding Information: Work at Princeton and Princeton-led ARPES measurements and theoretical work reported here was supported by the US Department of Energy under a Basic Energy Sciences grant (number DOE/BES DE-FG-02-05ER46200). This research used resources of the Stanford Synchrotron Radiation Lightsource (SSRL), which is a DOE Office of Science Facility, under contract number DE-AC02-76SF00515. S.J. was supported by the National Natural Science Foundation of China (U1832214, 11774007), the National Key R&D Program of China (2018YFA0305601) and the Key Research Program of the Chinese Academy of Science (grant number XDPB08-1). J.M. was supported by the National Natural Science Foundation of China (11774223, U1732154) and a Shanghai talent program. H.L. acknowledges the support by the Ministry of Science and Technology (MOST) in Taiwan under grant number MOST 109-2112-M-001-014-MY3. T.A.C. was supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE-1656466. M.Z.H. acknowledges support from the Miller Institute of Basic Research in Science at the University of California at Berkeley and Lawrence Berkeley National Laboratory in the form of a Visiting Miller Professorship during the early stages of this work. M.Z.H. also acknowledges visiting scientist support from IQIM at the California Institute of Technology. We thank D. Lu and M. Hashimoto for beamline support at SSRL in Menlo Park, California. We also thank D. Multer for his assistance in the soft X-ray ARPES measurements. Publisher Copyright: {\textcopyright} 2020, The Author(s).",
year = "2020",
month = dec,
day = "1",
doi = "10.1038/s41467-020-16879-1",
language = "English (US)",
volume = "11",
journal = "Nature communications",
issn = "2041-1723",
publisher = "Nature Publishing Group",
number = "1",
}