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  Graphene-like Dirac states and quantum spin Hall insulators in square-octagonal M X2 (M = Mo, W; X = S, Se, Te) isomers

Sun, Y., Felser, C., & Yan, B. (2015). Graphene-like Dirac states and quantum spin Hall insulators in square-octagonal M X2 (M = Mo, W; X = S, Se, Te) isomers. Physical Review B, 92(16): 165421, pp. 1-5. doi:10.1103/PhysRevB.92.165421.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0028-F6F1-4 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-5A1A-B
Genre: Journal Article

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 Creators:
Sun, Yan1, Author              
Felser, Claudia2, Author              
Yan, Binghai3, Author              
Affiliations:
1Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
2Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              
3Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863427              

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 Abstract: We studied the square-octagonal lattice of the transition metal dichalcogenide MX2 (with M =Mo,W; X = S, Se, and Te), as an isomer of the normal hexagonal compound of MX2. By band-structure calculations, we observe the graphene-like Dirac band structure in a rectangular lattice of MX2 with nonsymmorphic space group symmetry. Two bands with van Hove singularity points cross each at the Fermi energy, leading to two Dirac cones that locate at opposite momenta. Spin-orbit coupling can open a gap at these Dirac points, inside which gapless topological edge states exists as the quantum spin Hall (QSH) effect, the 2D topological insulator.

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Language(s): eng - English
 Dates: 2015-10-162015-10-16
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
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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: 92 (16) Sequence Number: 165421 Start / End Page: 1 - 5 Identifier: ISSN: 1098-0121
CoNE: /journals/resource/954925225008