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

doi:10.1038/s41467-021-24289-0

HFCAS OpenIR

	Observation of a singular Weyl point surrounded by charged nodal walls in PtGa
	Ma, J. -Z.1,2; Wu, Q. -S.3,4; Song, M.5,6; Zhang, S. -N.3,4; Guedes, E. B.1; Ekahana, S. A.1; Krivenkov, M.7; Yao, M. Y.8; Gao, S. -Y.9,10; Fan, W. -H.9,10; Qian, T.9,10,11; Ding, H.9,10,11,12; Plumb, N. C.1; Radovic, M.1; Dil, J. H.1,3; Xiong, Y. -M.5; Manna, K.8,13; Felser, C.8; Yazyev, O. V.3,4; Shi, M.1
	2021-06-28
发表期刊	NATURE COMMUNICATIONS
ISSN	2041-1723
通讯作者	Ma, J. -Z.(junzhama@cityu.edu.hk) ; Yazyev, O. V.(oleg.yazyev@epfl.ch) ; Shi, M.(ming.shi@psi.ch)
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.
DOI	10.1038/s41467-021-24289-0
关键词[WOS]	TOTAL-ENERGY CALCULATIONS ; NEUTRINOS ; SEMIMETAL ; ABSENCE ; LATTICE
收录类别	SCI
语种	英语
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]
项目资助者	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
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000669944900004
出版者	NATURE RESEARCH
引用统计	被引频次：13[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.hfcas.ac.cn:8080/handle/334002/123533
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.Paul Scherrer Inst, Photon Sci Div, Villigen, Switzerland 2.City Univ Hong Kong, Dept Phys, Kowloon, Hong Kong, Peoples R China 3.Ecole Polytech Fed Lausanne, Inst Phys, Lausanne, Switzerland 4.Ecole Polytech Fed Lausanne EPFL, Natl Ctr Computat Design & Discovery Novel Mat MA, Lausanne, Switzerland 5.Chinese Acad Sci, Anhui Prov Key Lab Condensed Matter Phys Extreme, High Field Magnet Lab, Hefei, Anhui, Peoples R China 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 11.Songshan Lake Mat Lab, Dongguan, Guangdong, Peoples R China 12.Univ Chinese Acad Sci, CAS Ctr Excellence Topol Quantum Computat, Beijing, Peoples R China 13.Indian Inst Technol Delhi, Dept Phys, New Delhi, India
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).