Coexistent three-component and two-component Weyl phonons in TiS, ZrSe, and HfTe
Coexistent three-component and two-component Weyl phonons in TiS, ZrSe, and HfTe
Topological semimetals with several types of three-dimensional (3D) fermion of electrons, such as Dirac fermions, Weyl fermions, Dirac nodal lines and triply degenerate nodal points have been theoretically predicted and then experimentally discovered in the electronic structures of a series of solid crystals. In analogy of various typical fermions, topological …