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Observation of a singular Weyl point surrounded by charged nodal walls in PtGa

文献类型：期刊论文

作者Ma, J. -Z.5,6; Wu, Q. -S.7,8; Song, M.9,10; Zhang, S. -N.7,8; Guedes, E. B.5; Ekahana, S. A.5; Krivenkov, M.11; Yao, M. Y.12; Gao, S. -Y.3,13; Fan, W. -H.3,13
刊名NATURE COMMUNICATIONS
出版日期2021-06-28
卷号12
ISSN号2041-1723
DOI10.1038/s41467-021-24289-0
通讯作者Ma, J. -Z.(junzhama@cityu.edu.hk) ; Yazyev, O. V.(oleg.yazyev@epfl.ch) ; Shi, M.(ming.shi@psi.ch)
英文摘要Constrained by the Nielsen-Ninomiya no-go theorem, in all so-far experimentally determined Weyl semimetals (WSMs) the Weyl points (WPs) always appear in pairs in the momentum space with no exception. As a consequence, Fermi arcs occur on surfaces which connect the projections of the WPs with opposite chiral charges. However, this situation can be circumvented in the case of unpaired WP, without relevant surface Fermi arc connecting its surface projection, appearing singularly, while its Berry curvature field is absorbed by nontrivial charged nodal walls. Here, combining angle-resolved photoemission spectroscopy with density functional theory calculations, we show experimentally that a singular Weyl point emerges in PtGa at the center of the Brillouin zone (BZ), which is surrounded by closed Weyl nodal walls located at the BZ boundaries and there is no Fermi arc connecting its surface projection. Our results reveal that nontrivial band crossings of different dimensionalities can emerge concomitantly in condensed matter, while their coexistence ensures the net topological charge of different dimensional topological objects to be zero. Our observation extends the applicable range of the original Nielsen-Ninomiya no-go theorem which was derived from zero dimensional paired WPs with opposite chirality. In all experimentally observed Weyl semimetals so far, the Weyl points always appear in pairs in the momentum space. Here, the authors report one unpaired Weyl point without surface Fermi arc emerging at the center of the Brillouin zone, which is surrounded by charged Weyl nodal walls in PtGa.
WOS关键词TOTAL-ENERGY CALCULATIONS ; NEUTRINOS ; SEMIMETAL ; ABSENCE ; LATTICE
资助项目NCCR-MARVEL - Swiss National Science Foundation ; Sino-Swiss Science and Technology Cooperation[IZLCZ2-170075] ; European Union's Horizon 2020 research and innovation program under the Marie Skodowska-Curie grant[701647] ; Swiss National Science Foundation[200021_182695] ; City University of Hong Kong[9610489] ; European Research Council[742068] ; Max Plank Society ; Max Plank-India ; Ministry of Science and Technology of China[2016YFA0401000] ; Ministry of Science and Technology of China[2016YFA0300600] ; National Natural Science Foundation of China[U1832202] ; Chinese Academy of Sciences[QYZDB-SSW-SLH043] ; Chinese Academy of Sciences[XDB33000000] ; Chinese Academy of Sciences[XDB28000000] ; European Union's Horizon 2020 research and innovation program[824123] ; European Union's Horizon 2020 research and innovation program[766566] ; Deutsche Forschungsgemeinschaft[258499086] ; Deutsche Forschungsgemeinschaft[FE 633/30-1]
WOS研究方向Science & Technology - Other Topics
语种英语
WOS记录号WOS:000669944900004
出版者NATURE RESEARCH
资助机构NCCR-MARVEL - Swiss National Science Foundation ; Sino-Swiss Science and Technology Cooperation ; European Union's Horizon 2020 research and innovation program under the Marie Skodowska-Curie grant ; Swiss National Science Foundation ; City University of Hong Kong ; European Research Council ; Max Plank Society ; Max Plank-India ; Ministry of Science and Technology of China ; National Natural Science Foundation of China ; Chinese Academy of Sciences ; European Union's Horizon 2020 research and innovation program ; Deutsche Forschungsgemeinschaft
源URL[http://ir.hfcas.ac.cn:8080/handle/334002/123532]  
专题中国科学院合肥物质科学研究院
通讯作者Ma, J. -Z.; Yazyev, O. V.; Shi, M.
作者单位1.Indian Inst Technol Delhi, Dept Phys, New Delhi, India
2.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing, Peoples R China
3.Chinese Acad Sci, Inst Phys, Beijing, Peoples R China
4.Songshan Lake Mat Lab, Dongguan, Guangdong, Peoples R China
5.Paul Scherrer Inst, Photon Sci Div, Villigen, Switzerland
6.City Univ Hong Kong, Dept Phys, Kowloon, Hong Kong, Peoples R China
7.Ecole Polytech Fed Lausanne, Inst Phys, Lausanne, Switzerland
8.Ecole Polytech Fed Lausanne EPFL, Natl Ctr Computat Design & Discovery Novel Mat MA, Lausanne, Switzerland
9.Chinese Acad Sci, Anhui Prov Key Lab Condensed Matter Phys Extreme, High Field Magnet Lab, Hefei, Anhui, Peoples R China
10.Univ Sci & Technol China, Hefei, Anhui, Peoples R China
推荐引用方式
GB/T 7714		 Ma, J. -Z.,Wu, Q. -S.,Song, M.,et al. Observation of a singular Weyl point surrounded by charged nodal walls in PtGa[J]. NATURE COMMUNICATIONS,2021,12.
APA Ma, J. -Z..,Wu, Q. -S..,Song, M..,Zhang, S. -N..,Guedes, E. B..,...&Shi, M..(2021).Observation of a singular Weyl point surrounded by charged nodal walls in PtGa.NATURE COMMUNICATIONS,12.
MLA Ma, J. -Z.,et al."Observation of a singular Weyl point surrounded by charged nodal walls in PtGa".NATURE COMMUNICATIONS 12(2021).

入库方式： OAI收割

来源：合肥物质科学研究院

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