Coexistence of Tunable Weyl Points and Topological Nodal Lines in Ternary Transition-Metal Telluride TaIrTe4

Abstract

We report a combined theoretical and experimental study on TaIrTe4, a potential candidate of the minimal model of type-II Weyl semimetals. Unexpectedly, an intriguing node structure with twelve Weyl points and a pair of nodal lines protected by mirror symmetry was found by first-principle calculations, with its complex signatures such as the topologically non-trivial band crossings and topologically trivial Fermi arcs cross-validated by angle-resolved photoemission spectroscopy. Through external strain, the number of Weyl points can be reduced to the theoretical minimum of four, and the appearance of the nodal lines can be switched between different mirror planes in momentum space. The coexistence of tunable Weyl points and nodal lines establishes ternary transition-metal tellurides as a unique test ground for topological state characterization and engineering.

arXiv comment14 pages, 4 figures

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• Bulk Fermi-surface of the Weyl type-II semi-metallic candidate MoTe2
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• Observation of superconductivity in pressurized Weyl semimetal candidate TaIrTe4
• Nonsaturating magnetoresistance and nontrivial band topology of type-II Weyl semimetal NbIrTe4
• Coexistence of topological Weyl and nodal-ring states in ferromagnetic and ferrimagnetic double perovskites
• Anisotropic transport and de Haas$-$van Alphen oscillations in quasi-one-dimensional TaPtTe${}_5$
• Weyl nodal point-line Fermion in ferromagnetic Eu${}_5$Bi${}_3$
• Ab initio study of the nonlinear optical properties and d.c. photocurrent of the Weyl semimetal TaIrTe${}_4$
• Magnetotransport properties of the layered CaAl2Si2 semimetal hosting multiple nontrivial topological states
• Optical conductivity of the type-II Weyl semimetal TaIrTe${}_4$
• Single Crystal Growth and Transport Properties of van der Waals Materials $AB$Te${}_4$ ($A/B$ = Ti, Zr, Hf)
• Orbital anomalous Hall effect in the few-layer Weyl semimetal TaIrTe4
• Observation of nearly identical superconducting transition temperatures in pressurized Weyl semimetal MIrTe4 (M=Nb and Ta)
• Self-regulated growth of candidate topological superconducting parkerite by molecular beam epitaxy
• Observation of near EF Fermi-arc van Hove singularity with prominent coupling to phonon in a van der Waals coupled Weyl semimetal