TaIrTe4 a ternary Type-II Weyl semi-metal
  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. 
K. Koepernik, D. Kasinathan, D.V. Efremov, Seunghyun Khim, Sergey   Borisenko, Bernd B\"uchner and Jeroen van den Brink
cond-mat.str-el cond-mat.mes-hall