Heavy Weyl fermion state in CeRu$_4$Sn$_6$
  A new type of topological state in strongly corrected condensed matter systems, heavy Weyl fermion state, has been found in a heavy fermion material CeRu$_4$Sn$_6$, which has no inversion symmetry. Both two different types of Weyl points, type I and II, can be found in the quasi-particle band structure obtained by the LDA+Guztwiller calculations, which can treat the strong correlation effects among the f-electrons from Cerium atoms. The surface calculations indicate that the topologically protected Fermi arc states exist on the (010) but not on the (001) surfaces. 
Yuanfeng Xu, Changming Yue, Hongming Weng, Xi Dai
cond-mat.str-el cond-mat.mtrl-sci