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  Topological origin of the type-II Dirac fermions in PtSe2

Li, Y., Xia, Y., Ekahana, S. A., Kumar, N., Jiang, J., Yang, L., et al. (2017). Topological origin of the type-II Dirac fermions in PtSe2. Physical Review Materials, 1(7): 074202, pp. 1-9. doi:10.1103/PhysRevMaterials.1.074202.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-27C8-3 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-27CA-1
Genre: Journal Article

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 Creators:
Li, Yiwei1, Author
Xia, Yunyouyou1, Author
Ekahana, Sandy Adhitia1, Author
Kumar, Nitesh2, Author              
Jiang, Juan1, Author
Yang, Lexian1, Author
Chen, Cheng1, Author
Liu, Chaoxing1, Author
Yan, Binghai3, Author              
Felser, Claudia4, Author              
Li, Gang1, Author
Liu, Zhongkai1, Author
Chen, Yulin1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863425              
3Binghai Yan, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863427              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863429              

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 Abstract: Group VIII transition-metal dichalcogenides have recently been proposed to host type-II Dirac fermions. They are Lorentz-violating quasiparticles marked by a strongly tilted conic dispersion along a certain momentum direction and therefore have no analogs in the standard model. Using high-resolution angle-resolved photoemission spectroscopy, we systematically studied the electronic structure of PtSe2 in the full three-dimensional Brillouin zone. As predicted, a pair of type-II Dirac crossings is experimentally confirmed along the k(z) axis. Interestingly, we observed conic surface states around time-reversal-invariant momenta (Gamma) over bar and (M) over bar points. The signatures of nontrivial topology are confirmed by the first-principles calculation, which shows an intricate parity inversion of bulk states. Our discoveries not only contribute to a better understanding of topological band structure in PtSe2 but also help further explore the exotic properties, as well as potential application, of group VIII transition-metal dichalcogenides.

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Language(s): eng - English
 Dates: 2017-12-222017-12-22
 Publication Status: Published in print
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 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1103/PhysRevMaterials.1.074202
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Title: Physical Review Materials
  Abbreviation : Phys. Rev. Mat.
Source Genre: Journal
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Publ. Info: College Park, MD : American Physical Society
Pages: - Volume / Issue: 1 (7) Sequence Number: 074202 Start / End Page: 1 - 9 Identifier: ISSN: 2475-9953
CoNE: /journals/resource/2475-9953