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  Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb

Liang, A. J., Jiang, J., Wang, M. X., Sun, Y., Kumar, N., Shekhar, C., et al. (2017). Observation of the topological surface state in the nonsymmorphic topological insulator KHgSb. Physical Review B, 96(16): 165143, pp. 1-8. doi:10.1103/PhysRevB.96.165143.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002E-28D5-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-9CCD-9
Genre: Journal Article

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 Creators:
Liang, A. J.1, Author
Jiang, J.1, Author
Wang, M. X.1, Author
Sun, Y.2, Author              
Kumar, N.2, Author              
Shekhar, C.3, Author              
Chen, C.1, Author
Peng, H.1, Author
Wang, C. W.1, Author
Xu, X.1, Author
Yang, H. F.1, Author
Cui, S. T.1, Author
Hong, G. H.1, Author
Xia, Y.-Y.2, Author              
Mo, S.-K.1, Author
Gao, Q.1, Author
Zhou, X. J.1, Author
Yang, L. X.1, Author
Felser, C.4, Author              
Yan, B. H.1, Author
Liu, Z. K.1, AuthorChen, 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              
3Chandra Shekhar, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863428              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Topological insulators represent unusual topological quantum states, typically with gapped bulk band structure but gapless surface Dirac fermions protected by time-reversal symmetry. Recently, a distinct kind of topological insulator resulting from nonsymmorphic crystalline symmetry was proposed in the KHgX (X = As, Sb, Bi) compounds. Unlike regular topological crystalline insulators, the nonsymmorphic glide-reflection symmetry in KHgX guarantees the appearance of an exotic surface fermion with hourglass shape dispersion (where two pairs of branches switch their partners) residing on its (010) side surface, contrasting to the usual two-dimensional Dirac fermion form. Here, by using high-resolution angle-resolved photoemission spectroscopy, we systematically investigate the electronic structures of KHgSb on both (001) and (010) surfaces and reveal the unique in-gap surface states on the (010) surface with delicate dispersion consistent with the "hourglass Fermion" recently proposed. Our experiment strongly supports that KHgSb is a nonsymmorphic topological crystalline insulator with hourglass fermions, which serves as an important step to the discovery of unique topological quantum materials and exotic fermions protected by nonsymmorphic crystalline symmetry.

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Language(s): eng - English
 Dates: 2017-10-252017-10-25
 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: 96 (16) Sequence Number: 165143 Start / End Page: 1 - 8 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008