Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn

doi:10.1038/s41467-020-17462-4

	Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn
	Liu, Zhonghao 1,2,3; Li, Man 4,5,6; Wang, Qi 4,5; Wang, Guangwei 7,8; Wen, Chenhaoping9 ; Jiang, Kun 10; Lu, Xiangle 1,2,3; Yan, Shichao9 ; Huang, Yaobo 6; Shen, Dawei 1,2,3; Yin, Jia-Xin 11; Wang, Ziqiang 10; Yin, Zhiping 7,8; Lei, Hechang 4,5; Wang, Shancai 4,5
	2020-08-10
发表期刊	NATURE COMMUNICATIONS
ISSN	2041-1723
卷号	11 期号:1
发表状态	已发表
DOI	10.1038/s41467-020-17462-4
摘要	Layered kagome-lattice 3d transition metals are emerging as an exciting platform to explore the frustrated lattice geometry and quantum topology. However, the typical kagome electronic bands, characterized by sets of the Dirac-like band capped by a phase-destructive flat band, have not been clearly observed, and their orbital physics are even less well investigated. Here, we present close-to-textbook kagome bands with orbital differentiation physics in CoSn, which can be well described by a minimal tight-binding model with single-orbital hopping in Co kagome lattice. The capping flat bands with bandwidth less than 0.2eV run through the whole Brillouin zone, especially the bandwidth of the flat band of out-of-plane orbitals is less than 0.02eV along Gamma -M. The energy gap induced by spin-orbit interaction at the Dirac cone of out-of-plane orbitals is much smaller than that of in-plane orbitals, suggesting orbital-selective character of the Dirac fermions. The understanding of kagome bands, which are characterized by Dirac-like bands capped by a flat band, remains largely elusive. Here, Liu et al. report the observation of a flat band and Dirac bands as ideal features of kagome bands in CoSn, revealing orbital-selective character.
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收录类别	SCI ; SCIE
语种	英语
资助项目	National Key R&D Program of China[2016YFA0300204][2016YFA0300504][2016YFA0302300][2018YFE0202600][2016YFA0401000] ; National Natural Science Foundation of China[11704394][11774423][11774421][11822412][11674030][11574394][U1832102] ; Research Funds of Renmin University of China (RUC)[15XNLQ07][18XNLG14][19XNLG17] ; Science and Technology Commission of Shanghai Municipality (STCSM)[18QA1403100] ; U.S. Department of Energy, Basic Energy Sciences[DE- FG02-99ER45747] ; Ministry of Science and Technology of China[2016YFA0401002] ; NSFC[11227902]
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:000561071600007
出版者	NATURE PUBLISHING GROUP
WOS关键词	DYNAMICS
原始文献类型	Article
引用统计
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/123080
专题	物质科学与技术学院_PI研究组_颜世超组
通讯作者	Liu, Zhonghao; Yin, Zhiping; Lei, Hechang; Wang, Shancai
作者单位	1.Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, Ctr Excellence Superconducting Elect, Shanghai 200050, Peoples R China 3.Univ Chinese Acad Sci, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China 4.Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China 5.Renmin Univ China, Beijing Key Lab Optoelect Funct Mat & Micronano D, Beijing 100872, Peoples R China 6.Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai 201204, Peoples R China 7.Beijing Normal Univ, Dept Phys, Beijing 100875, Peoples R China 8.Beijing Normal Univ, Ctr Adv Quantum Studies, Beijing 100875, Peoples R China 9.ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China 10.Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA 11.Princeton Univ, Dept Phys, Lab Topol Quantum Matter & Adv Spect B7, Princeton, NJ 08544 USA
推荐引用方式 GB/T 7714	Liu, Zhonghao,Li, Man,Wang, Qi,et al. Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn[J]. NATURE COMMUNICATIONS,2020,11(1).
APA	Liu, Zhonghao.,Li, Man.,Wang, Qi.,Wang, Guangwei.,Wen, Chenhaoping.,...&Wang, Shancai.(2020).Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn.NATURE COMMUNICATIONS,11(1).
MLA	Liu, Zhonghao,et al."Orbital-selective Dirac fermions and extremely flat bands in frustrated kagome-lattice metal CoSn".NATURE COMMUNICATIONS 11.1(2020).