Dirac line nodes and effect of spin-orbit coupling in the nonsymmorphic critical semimetals MSiS (M = Hf, Zr)

doi:10.1103/PhysRevB.95.125126

	Dirac line nodes and effect of spin-orbit coupling in the nonsymmorphic critical semimetals MSiS (M = Hf, Zr)
	Chen, C.1; Xu, X.2; Jiang, J.3,4,5,6 ; Wu, S. -C.7; Qi, Y. P.7; Yang, L. X.2; Wang, M. X.3,4 ; Sun, Y.7; Schroeter, N. B. M.1; Yang, H. F.1,3,4,8 ; Schoop, L. M.9; Lv, Y. Y.10,11; Zhou, J.10,11; Chen, Y. B.10,11; Yao, S. H.10,11; Lu, M. H.10,11; Chen, Y. F.10,11; Felser, C.7; Yan, B. H.3,4,7 ; Liu, Z. K.3,4 ; Chen, Y. L.1,2,3,4
	2017-03-22
发表期刊	PHYSICAL REVIEW B
ISSN	2469-9950
卷号	95 期号:12
发表状态	已发表
DOI	10.1103/PhysRevB.95.125126
摘要	Topological Dirac semimetals (TDSs) represent a new state of quantum matter recently discovered that offers a platform for realizing many exotic physical phenomena. A TDS is characterized by the linear touching of bulk (conduction and valance) bands at discrete points in the momentum space [i.e., three-dimensional (3D) Dirac points], such as in Na3Bi and Cd3As2. More recently, new types of Dirac semimetals with robust Dirac line nodes (with nontrivial topology or near the critical point between topological phase transitions) have been proposed that extend the bulk linear touching from discrete points to one-dimensional (1D) lines. In this paper, using angle-resolved photoemission spectroscopy (ARPES), we explored the electronic structure of the nonsymmorphic crystals MSiS (M = Hf, Zr). Remarkably, by mapping out the band structure in the full 3D Brillouin zone (BZ), we observed two sets of Dirac line-nodes in parallel with the k(z) axis and their dispersions. Interestingly, along directions other than the line nodes in the 3D BZ, the bulk degeneracy is lifted by spin-orbit coupling (SOC) in both compounds with larger magnitude in HfSiS. Our paper not only experimentally confirms a new Dirac line-node semimetal family protected by nonsymmorphic symmetry but also helps understanding and further exploring the exotic properties, as well as practical applications of the MSiS family of compounds.
收录类别	SCI ; EI
语种	英语
资助项目	National Research Foundation, Korea, through the SRC Center for Topological Matter[2011-0030787]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:000399219500001
出版者	AMER PHYSICAL SOC
EI入藏号	20191906872361
EI主题词	Binary alloys ; Bismuth alloys ; Cadmium alloys ; Crystal structure ; Electronic structure ; Photoelectron spectroscopy ; Quantum theory ; Sodium alloys
EI分类号	Alkali Metals:549.1 ; Nonferrous Metals and Alloys excluding Alkali and Alkaline Earth Metals:549.3 ; Combinatorial Mathematics, Includes Graph Theory, Set Theory:921.4 ; Quantum Theory; Quantum Mechanics:931.4 ; Crystal Lattice:933.1.1
WOS关键词	CD3AS2 ; DISCOVERY ; CRYSTAL ; PHASE ; ZRSIS ; ARCS ; TAAS
原始文献类型	Article
引用统计	被引频次：116[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/1459
专题	物质科学与技术学院_特聘教授组_陈宇林物质科学与技术学院_PI研究组_颜丙海组物质科学与技术学院_PI研究组_柳仲楷组大科学中心_PI研究组_刘志组
通讯作者	Liu, Z. K.; Chen, Y. L.
作者单位	1.Univ Oxford, Dept Phys, Oxford OX1 3PU, England 2.Tsinghua Univ, Dept Phys, State Key Lab Low Dimens Quantum Phys, Beijing 100084, Peoples R China 3.ShanghaiTech Univ, Sch Phys Sci & Technol, 393 Middle Huaxia Rd, Shanghai 201210, Peoples R China 4.Chinese Acad Sci, Shanghai Sci Res Ctr, 393 Middle Huaxia Rd, Shanghai 201210, Peoples R China 5.Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA 6.POSTECH, Accelerator Lab, Pohang 790784, South Korea 7.Max Planck Inst Chem Phys Solids, D-01187 Dresden, Germany 8.Chinese Acad Sci, SIMIT, State Key Lab Funct Mat Informat, Shanghai 200050, Peoples R China 9.Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany 10.Nanjing Univ, Sch Phys, Nat Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China 11.Nanjing Univ, Dept Mat Sci & Engn, Nanjing 210093, Jiangsu, Peoples R China
通讯作者单位	物质科学与技术学院
推荐引用方式 GB/T 7714	Chen, C.,Xu, X.,Jiang, J.,et al. Dirac line nodes and effect of spin-orbit coupling in the nonsymmorphic critical semimetals MSiS (M = Hf, Zr)[J]. PHYSICAL REVIEW B,2017,95(12).
APA	Chen, C..,Xu, X..,Jiang, J..,Wu, S. -C..,Qi, Y. P..,...&Chen, Y. L..(2017).Dirac line nodes and effect of spin-orbit coupling in the nonsymmorphic critical semimetals MSiS (M = Hf, Zr).PHYSICAL REVIEW B,95(12).
MLA	Chen, C.,et al."Dirac line nodes and effect of spin-orbit coupling in the nonsymmorphic critical semimetals MSiS (M = Hf, Zr)".PHYSICAL REVIEW B 95.12(2017).