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  Spin texture and mirror Chern number in Hg-based chalcogenides

Wang, Q.-Z., Wu, S.-C., Felser, C., Yan, B., & Liu, C.-X. (2015). Spin texture and mirror Chern number in Hg-based chalcogenides. Physical Review B, 91(16): 165435, pp. 1-9. doi:10.1103/PhysRevB.91.165435.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0027-7AEE-5 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-61F3-E
Genre: Journal Article

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 Creators:
Wang, Qing-Ze1, Author
Wu, Shu-Chun2, Author              
Felser, Claudia3, Author              
Yan, Binghai4, Author              
Liu, Chao-Xing1, Author
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: One important feature of surface states in topological insulators is the so-called "spin-momentum locking," which means that electron spin is oriented along a fixed direction for a given momentum and forms a texture in the momentum space. In this work, we study spin textures of two typical topological insulators in Hg-based chalcogenides, namely, HgTe and HgS, based on both the first-principles calculation and the eight-band Kane model. We find opposite helicities of spin textures between these two materials, originating from the opposite signs of spin-orbit couplings. Based on the effective Kane model, we present a physical picture to understand opposite spin textures in these two materials with the help of the relationship between spin textures and mirror Chern numbers. We also reveal the existence of gapless states at the interface between HgTe and HgS due to the opposite spin textures and opposite mirror Chern numbers.

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Language(s): eng - English
 Dates: 2015-04-30
 Publication Status: Published in print
 Pages: -
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 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: 91 (16) Sequence Number: 165435 Start / End Page: 1 - 9 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008