Observation of Weyl Nodes in Robust Type-II Weyl Semimetal WP2
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland
- Swiss Light Source, Paul Scherrer Institut, CH-5232 Villigen, Switzerland and Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland and Institute of Advanced Studies, Wuhan University, Wuhan 430072, China
- Institute of Physics, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland and National Centre for Computational Design and Discovery of Novel Materials MARVEL, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland
DOI10.24435/materialscloud:2019.0091/v1 (version v1, submitted on 19 December 2019)
How to cite this entry
M.-Y Yao, N. Xu, Q.S. Wu, O.V. Yazyev, M. Shi, Observation of Weyl Nodes in Robust Type-II Weyl Semimetal WP2, Materials Cloud Archive (2019), doi: 10.24435/materialscloud:2019.0091/v1.
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 WTe2, MoTe2, WP2 and MoP2 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 Chern numbers C=2 or C=-2, 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. Input files for theoretical calculations and raw data from ARPES measurements are included in this record.
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|248.8 MiB||Input files for theoretical calculations and raw data from ARPES measurements are included in the .tar.gz file.|
|1.3 KiB||Description of the data.|
19 December 2019 [This version]