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.
- Authors:
-
[1];
[1];
[1];
[1];
[4];
[6];
[7];
[8]
- Princeton Univ., NJ (United States). Lab. for Topological Quantum Matter and Advanced Spectroscopy. Dept. of Physics
- Peking Univ., Beijing (China). International Center for Quantum Materials. School of Physics
- Princeton Univ., NJ (United States). Lab. for Topological Quantum Matter and Advanced Spectroscopy. Dept. of Physics; Rigetti Computing, Berkeley, CA (United States)
- Shanghai Jiao Tong Univ. (China). Key Lab. of Artificial Structures and Quantum Control. School of Physics and Astronomy
- Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
- Academia Sinica, Taipei (Taiwan). Inst. of Physics
- Peking Univ., Beijing (China). International Center for Quantum Materials. School of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
- Princeton Univ., NJ (United States). Lab. for Topological Quantum Matter and Advanced Spectroscopy. Dept. of Physics. Princeton Inst. for Science and Technology of Materials; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Princeton Univ., NJ (United States); Peking Univ., Beijing (China); Shanghai Jiao Tong Univ. (China); Academia Sinica, Taipei (Taiwan); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC); National Key Research and Development Program of China; Key Research Program of the Chinese Academy of Science; Ministry of Science and Technology (MOST) (Taiwan)
- OSTI Identifier:
- 1646998
- Alternate Identifier(s):
- OSTI ID: 1659724; OSTI ID: 1660278
- Grant/Contract Number:
- FG02-05ER46200; AC02-76SF00515; DGE-1656466; U1832214; 11774007; 2018YFA0305601; XDPB08-1; 11774223; U1732154; MOST 109-2112-M-001-014-MY3; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 11; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; condensed-matter physics; theory and computation
Citation Formats
Sanchez, Daniel S., Chang, Guoqing, Belopolski, Ilya, Lu, Hong, Yin, Jia-Xin, Alidoust, Nasser, Xu, Xitong, Cochran, Tyler A., Zhang, Xiao, Bian, Yi, Zhang, Songtian S., Liu, Yi-Yuan, Ma, Jie, Bian, Guang, Lin, Hsin, Xu, Su-Yang, Jia, Shuang, and Hasan, M. Zahid. Observation of Weyl fermions in a magnetic non-centrosymmetric crystal. United States: N. p., 2020.
Web. doi:10.1038/s41467-020-16879-1.
Sanchez, Daniel S., Chang, Guoqing, Belopolski, Ilya, Lu, Hong, Yin, Jia-Xin, Alidoust, Nasser, Xu, Xitong, Cochran, Tyler A., Zhang, Xiao, Bian, Yi, Zhang, Songtian S., Liu, Yi-Yuan, Ma, Jie, Bian, Guang, Lin, Hsin, Xu, Su-Yang, Jia, Shuang, & Hasan, M. Zahid. Observation of Weyl fermions in a magnetic non-centrosymmetric crystal. United States. https://doi.org/10.1038/s41467-020-16879-1
Sanchez, Daniel S., Chang, Guoqing, Belopolski, Ilya, Lu, Hong, Yin, Jia-Xin, Alidoust, Nasser, Xu, Xitong, Cochran, Tyler A., Zhang, Xiao, Bian, Yi, Zhang, Songtian S., Liu, Yi-Yuan, Ma, Jie, Bian, Guang, Lin, Hsin, Xu, Su-Yang, Jia, Shuang, and Hasan, M. Zahid. Fri .
"Observation of Weyl fermions in a magnetic non-centrosymmetric crystal". United States. https://doi.org/10.1038/s41467-020-16879-1. https://www.osti.gov/servlets/purl/1646998.
@article{osti_1646998,
title = {Observation of Weyl fermions in a magnetic non-centrosymmetric crystal},
author = {Sanchez, Daniel S. and Chang, Guoqing and Belopolski, Ilya and Lu, Hong and Yin, Jia-Xin and Alidoust, Nasser and Xu, Xitong and Cochran, Tyler A. and Zhang, Xiao and Bian, Yi and Zhang, Songtian S. and Liu, Yi-Yuan and Ma, Jie and Bian, Guang and Lin, Hsin and Xu, Su-Yang and Jia, Shuang and Hasan, M. Zahid},
abstractNote = {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.},
doi = {10.1038/s41467-020-16879-1},
journal = {Nature Communications},
number = 1,
volume = 11,
place = {United States},
year = {Fri Jul 03 00:00:00 EDT 2020},
month = {Fri Jul 03 00:00:00 EDT 2020}
}
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