Observation of Weyl nodes in robust type-II Weyl semimetal WP2

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)Te2 and (W,Mo)P2 families of materials, a large numbers of experiments have been dedicated to unveil the possible manifestation of type-II WSM, e.g. the 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 4-fold degenerate band-crossing points with Chern numbers C = $\pm$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 which could manifest in novel transport properties.

arXiv comment13 pages, 3 figures

References in corpus (24)

• Discovery of a Weyl Fermion Semimetal and Topological Fermi Arcs
• Type-II Weyl Semimetals
• Weyl semimetal phase in non-centrosymmetric transition metal monophosphides
• Observation of Weyl nodes in TaAs
• Experimental observation of topological Fermi arcs in type-II Weyl semimetal MoTe2
• Prediction of the Weyl semimetal in the orthorhombic MoTe2
• Spectroscopic evidence for type II Weyl semimetal state in MoTe2
• Probing the Low-Energy Electronic Structure of Complex Systems by ARPES
• MoTe2: A Type-II Weyl Topological Metal
• Observation of Fermi Arcs in Type-II Weyl Semimetal Candidate WTe2
• Observation of Weyl nodes and Fermi arcs in TaP
• Structured Weyl Points in Spin-Orbit Coupled Fermionic Superfluids
• Arc-tunable Weyl Fermion metallic state in Mo${}_x$W${}_{1-x}$Te${}_2$
• Extremely high magnetoresistance and conductivity in the type-II Weyl semimetals WP2 and MoP2
• Fermi arcs and their topological character in the candidate type-II Weyl semimetal MoTe2
• Spectroscopic Evidence of Type II Weyl Semimetal State in WTe2
• Observation of Large Topologically Trivial Fermi-Arcs in the Candidate Type-II Weyl Semimetal WTe2
• Robust Type-II Weyl Semimetal Phase in Transition Metal Diphosphides XP${}_2$ (X = Mo, W)
• Discovery of a new type of topological Weyl fermion semimetal state in Mo${}_x$W${}_{1-x}$Te${}_2$
• Observation of Fermi arc spin texture in TaAs
• Measuring Chern numbers above the Fermi level in the Type II Weyl semimetal Mo${}_x$W${}_{1-x}$Te${}_2$
• Surface Fermi arc connectivity in the type-II Weyl semimetal candidate WTe${}_2$
• Distinct evolutions of Weyl fermion quasiparticles and Fermi arcs with bulk band topology in Weyl semimetals
• Stable Weyl points, trivial surface states and particle-hole compensation in WP2

Cited by in corpus (27)

• Topological quantum materials from the viewpoint of chemistry
• Type-III Weyl Semimetals: (TaSe4)2I
• Three-dimensional electronic structure in ferromagnetic ${\text{Fe}}_3{\text{Sn}}_2$ with breathing kagome bilayers
• Evidence for dominant phonon-electron scattering in Weyl semimetal WP${}_2$
• Ideal type-II Weyl phase and topological transition in phononic crystals
• Multiple Weyl fermions in the noncentrosymmetric semimetal LaAlSi
• Anomalous Hall transport in tilted multi-Weyl semimetals
• Strong and Tunable Electrical-Anisotropy in Type-II Weyl Semimetal Candidate WP2 with Broken Inversion Symmetry
• Andreev Reflection in Fermi Arc Surface States of Weyl Semimetals
• Butterfly-like anisotropic magnetoresistance and angle-dependent Berry phase in Type-II Weyl semimetal WP2
• Observation of Single Pair of Type-III Weyl Points in Sonic Crystals
• Chiral magnetic effect in lattice models of tilted multi-Weyl semimetals
• Landau level spectrum and magneto-optical conductivity in tilted Weyl semimetal
• Gate-tunable Lifshitz transition of Fermi arcs and its nonlocal transport signatures
• Strong nonlinear optical response and transient symmetry switching in Type-II Weyl semimetal $\beta$-WP2
• Room-Temperature Anisotropic Plasma Mirror and Polarization-Controlled Optical Switch Based on Type-II Weyl Semimetal WP2
• Giant Chern number of a Weyl nodal surface without upper limit
• Highly anisotropic Drude-weight-reduction and enhanced linear-dichroism in van der Waals Weyl semimetal Td-MoTe2 with coherent interlayer electronic transport
• Observation of pressure-induced Weyl state and superconductivity in a chirality-neutral Weyl semimetal candidate SrSi2
• Lifshitz transitions and Weyl semimetals from a topological superconductor with supercurrent flow
• Spin susceptibilities in magnetic type-I and type-II Weyl semimetals
• Conductance oscillation in surface junctions of Weyl semimetals
• Semiconducting Electronic Structure of the Ferromagnetic Spinel $\mathbf{Hg}{\mathbf{Cr}}_2{\mathbf{Se}}_4$ Revealed by Soft-X-Ray Angle-Resolved Photoemission Spectroscopy
• Theory of universal differential conductance of magnetic Weyl type -II junctions
• Phonon Weyl points and chiral edge modes with unconventional Fermi arcs in NbSi${}_2$
• Fano resonances in tilted Weyl semimetals in an oscillating quantum well
• k-Resolved electronic structure of buried heterostructure and impurity systems by soft-X-ray ARPES