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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.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [2]; ORCiD logo [1];  [3];  [2];  [1];  [2];  [2]; ORCiD logo [1];  [2]; ORCiD logo [4];  [5]; ORCiD logo [6];  [1]; ORCiD logo [7]; ORCiD logo [8]
  1. Princeton Univ., NJ (United States). Lab. for Topological Quantum Matter and Advanced Spectroscopy. Dept. of Physics
  2. Peking Univ., Beijing (China). International Center for Quantum Materials. School of Physics
  3. Princeton Univ., NJ (United States). Lab. for Topological Quantum Matter and Advanced Spectroscopy. Dept. of Physics; Rigetti Computing, Berkeley, CA (United States)
  4. Shanghai Jiao Tong Univ. (China). Key Lab. of Artificial Structures and Quantum Control. School of Physics and Astronomy
  5. Univ. of Missouri, Columbia, MO (United States). Dept. of Physics and Astronomy
  6. Academia Sinica, Taipei (Taiwan). Inst. of Physics
  7. Peking Univ., Beijing (China). International Center for Quantum Materials. School of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
  8. 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 Lab. (LBNL), Berkeley, CA (United States); SLAC National Accelerator Lab., 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 (NNSFC); National Key R&D 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:
Journal Article: 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:
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. 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, and Hasan, M. Zahid. Fri . "Observation of Weyl fermions in a magnetic non-centrosymmetric crystal". United States. doi: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},
issn = {2041-1723},
number = 1,
volume = 11,
place = {United States},
year = {2020},
month = {7}
}

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