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
Source PublicationPHYSICAL REVIEW B
AbstractTopological 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.
Indexed BySCI ; EI
Funding ProjectNational Research Foundation, Korea, through the SRC Center for Topological Matter[2011-0030787]
WOS Research AreaMaterials Science ; Physics
WOS SubjectMaterials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS IDWOS:000399219500001
EI Accession Number20191906872361
EI KeywordsBinary alloys ; Bismuth alloys ; Cadmium alloys ; Crystal structure ; Electronic structure ; Photoelectron spectroscopy ; Quantum theory ; Sodium alloys
EI Classification NumberAlkali 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
Original Document TypeArticle
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Document Type期刊论文
Corresponding AuthorLiu, Z. K.; Chen, Y. L.
Affiliation1.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
Corresponding Author AffilicationSchool of Physical Science and Technology
Recommended Citation
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).
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