TaIrTe4 a ternary Type-II Weyl semi-metal

Abstract

In metallic condensed matter systems two different types of Weyl fermions can in principle emerge, with either a vanishing (type-I) or with a finite (type-II) density of states at the Weyl node energy. So far only WTe2 and MoTe2 were predicted to be type-II Weyl semi-metals. Here we identify TaIrTe4 as a third member of this family of topological semi-metals. TaIrTe4 has the attractive feature that it hosts only four well-separated Weyl points, the minimum imposed by symmetry. Moreover, the resulting topological surface states - Fermi arcs connecting Weyl nodes of opposite chirality - extend to about 1/3 of the surface Brillouin zone. This large momentum-space separation is very favorable for detecting the Fermi arcs spectroscopically and in transport experiments.

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• Emergent Weyl spinors in multi-fermion systems
• Observation of Fermi Arcs in non-Centrosymmetric Weyl Semi-metal Candidate NbP
• A strongly robust Weyl fermion semimetal state in Ta${}_3$S${}_2$

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