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  6. New study gives compelling evidence that tungsten diphosphide is a type-II Weyl semimetal

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3 May 2019

New study gives compelling evidence that tungsten diphosphide is a type-II Weyl semimetal

Type-II Weyl semimetal WP2
FIG. 1. (a) Crystal structure of WP2. (b) Bulk and surface BZ of WP2 with high-symmetry points labeled. (c) Schematic band dispersions of type-II Weyl nodes in the kx-ky plane of the momentum space. (d) WP2 core-level spectrum, obtained with hν = 650 eV

Researchers at NCCR MARVEL have combined first principles calculations with soft X-ray angle-resolved photoemission spectroscopy to examine tungsten diphosphide’s electronic structure, characterizing its Weyl nodes for the very first time. In agreement with density functional theory calculations, the results revealed two pairs of Weyl nodes lying at different binding energies. The observation of the Weyl nodes, as well as the tilted cone-like dispersions in the vicinity of the nodal points, provides compelling evidence that the material is a robust type-II Weyl semimetal with broken Lorentz invariance. This is as MARVEL researchers predicted two years ago. The research has been published in Physical Review Letters as an Editor's Suggestion.

Additional Information

Link to full NCCR MARVEL text http://nccr-marvel.ch/highlights/2019-04weyl

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Prof. Dr Ming Shi
Spectroscopy of Novel Materials Group
Paul Scherrer Institute, Forschungsstrasse 111, 5232 Villigen PSI, Switzerland
Telephone: +41 56 310 21 11
E-mail: ming.shi@psi.ch

Original Publication

Observation of Weyl Nodes in Robust Type-II Weyl Semimetal WP2
M.-Y. Yao, N. Xu, Q. S. Wu, G. Autès, N. Kumar, V. N. Strocov, N. C. Plumb, M. Radovic, O. V. Yazyev, C. Felser, J. Mesot, and M. Shi
Phys. Rev. Lett. 122, 176402 (2019) – Published 3 May 2019
DOI: 10.1103/PhysRevLett.122.176402

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