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  Observation of Weyl Nodes in Robust Type-II Weyl Semimetal WP2

Yao, M.-Y., Xu, N., Wu, Q. S., Autès, G., Kumar, N., Strocov, V. N., et al. (2019). Observation of Weyl Nodes in Robust Type-II Weyl Semimetal WP2. Physical Review Letters, 122(17): 176402, pp. 1-5. doi:10.1103/PhysRevLett.122.176402.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-A82C-F Version Permalink: http://hdl.handle.net/21.11116/0000-0003-A82E-D
Genre: Journal Article

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 Creators:
Yao, M.-Y.1, Author
Xu, N.1, Author
Wu, Q. S.1, Author
Autès, G.1, Author
Kumar, N.2, Author              
Strocov, V. N.1, Author
Plumb, N. C.1, Author
Radovic, M.1, Author
Yazyev, O. V.1, Author
Felser, C.3, Author              
Mesot, J.1, Author
Shi, M.1, 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              

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 Abstract: Distinct to type-I Weyl semimetals (WSMs) that host quasiparticles described by the Weyl equation, the energy dispersion of quasiparticles in type-II WSMs violates Lorentz invariance and the Weyl cones in the momentum space are tilted. Since it was proposed that type-II Weyl fermions could emerge from (W, Mo)Te-2, and (W, Mo)P-2 families of materials, a large number of experiments have been dedicated to unveiling the possible manifestation of type-II WSMs, e.g., surface-state Fermi arcs. However, the interpretations of the experimental results are very controversial. Here, using angle-resolved photoemission spectroscopy supported by the first-principles calculations, we probe the tilted Weyl cone bands in the bulk electronic structure of WP2 directly, which are at the origin of Fermi arcs at the surfaces and transport properties related to the chiral anomaly in type-II WSMs. Our results ascertain that, due to the spin-orbit coupling, the Weyl nodes originate from the splitting of fourfold degenerate band-crossing points with Chem numbers C = +/- 2 induced by the crystal symmetries of WP2, which is unique among all the discovered WSMs. Our finding also provides a guiding line to observe the chiral anomaly that could manifest in novel transport properties.

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Language(s): eng - English
 Dates: 2019-05-032019-05-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
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Title: Physical Review Letters
  Abbreviation : Phys. Rev. Lett.
Source Genre: Journal
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Publ. Info: Woodbury, N.Y. : American Physical Society
Pages: - Volume / Issue: 122 (17) Sequence Number: 176402 Start / End Page: 1 - 5 Identifier: ISSN: 0031-9007
CoNE: https://pure.mpg.de/cone/journals/resource/954925433406_1