TaIrTe4: A ternary type-II Weyl semimetal

Koepernik, K.; Kasinathan, D.; Efremov, D. V.; Khim, Seunghyun; Borisenko, Sergey; Buechner, Bernd; van den Brink, Jeroen

doi:10.1103/PhysRevB.93.201101

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TaIrTe₄: A ternary type-II Weyl semimetal

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Kasinathan, D.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Koepernik, K., Kasinathan, D., Efremov, D. V., Khim, S., Borisenko, S., Buechner, B., et al. (2016). TaIrTe₄: A ternary type-II Weyl semimetal. Physical Review B, 93(20): 201101, pp. 1-5. doi:10.1103/PhysRevB.93.201101.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002A-C520-3

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 semimetals. Here we identify TaIrTe4 as a third member of this family of topological semimetals. 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.