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

doi:10.1038/s41467-021-24289-0

	Observation of a singular Weyl point surrounded by charged nodal walls in PtGa
	Ma, J. -Z.2,3; Wu, Q. -S.4,5; Song, M.1,6; Zhang, S. -N.4,5; Guedes, E. B.2; Ekahana, S. A.2; Krivenkov, M.7; Yao, M. Y.8; Gao, S. -Y.9,10; Fan, W. -H.9,10
刊名	NATURE COMMUNICATIONS
	2021-06-28
卷号	12
ISSN号	2041-1723
DOI	10.1038/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.
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关键词	TOTAL-ENERGY CALCULATIONS ; NEUTRINOS ; SEMIMETAL ; ABSENCE ; LATTICE
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	NATURE RESEARCH
WOS记录号	WOS:000669944900004
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
内容类型	期刊论文
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.Chinese Acad Sci, Anhui Prov Key Lab Condensed Matter Phys Extreme, High Field Magnet Lab, Hefei, Anhui, Peoples R China 2.Paul Scherrer Inst, Photon Sci Div, Villigen, Switzerland 3.City Univ Hong Kong, Dept Phys, Kowloon, Hong Kong, Peoples R China 4.Ecole Polytech Fed Lausanne, Inst Phys, Lausanne, Switzerland 5.Ecole Polytech Fed Lausanne EPFL, Natl Ctr Computat Design & Discovery Novel Mat MA, Lausanne, Switzerland 6.Univ Sci & Technol China, Hefei, Anhui, Peoples R China 7.Helmholtz Zentrum Berlin Mat & Energie, Elektronenspeicherring BESSY II, Berlin, Germany 8.Max Planck Inst Chem Phys Solids, Dresden, Germany 9.Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing, Peoples R China 10.Chinese Acad Sci, Inst Phys, Beijing, 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).