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

Chen, C., Xu, X., Jiang J, J., Wu, S.-C., Qi, Y. P., Yang, L. X., et al. (2017). Dirac line nodes and effect of spin-orbit coupling in the nonsymmorphic critical semimetals MSiS (M = Hf, Zr). Physical Review B, 95(12): 125126, pp. 1-7. doi:10.1103/PhysRevB.95.125126.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-3D05-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-CCC0-A
Genre: Journal Article

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 Creators:
Chen, C.1, Author
Xu, X.1, Author
Jiang J, J.1, Author
Wu, S.-C.2, Author              
Qi, Y. P.2, Author              
Yang, L. X.1, Author
Wang, M. X.1, Author
Sun, Y.2, Author              
Schroeter, N. B. M.1, Author
Yang, H. F.1, Author
Schoop, L. M.1, Author
Lv, Y. Y.1, Author
Zhou, J.1, Author
Chen, Y. B.1, Author
Yao, S. H.1, Author
Lu, M. H.1, Author
Chen, Y. F.1, Author
Felser, C.3, Author              
Yan, B. H.4, Author              
Liu, Z. K.1, Author
Chen, Y. L.1, Author more..
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              
4Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863427              

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 Abstract: 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.

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Language(s): eng - English
 Dates: 2017-03-222017-03-22
 Publication Status: Published in print
 Pages: -
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 95 (12) Sequence Number: 125126 Start / End Page: 1 - 7 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008