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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.
