Quasi-one-dimensional characters in topological semimetal TaNiTe ₅

One-dimensional (1D) topological insulators are superior for low-dissipation applications owing to the 1D character of surface states where scatterings other than prohibited backscattering are further restricted. Among the proposed candidates for 1D topological materials, TaNiTe ₅ has attracted intensive attention for its quasi-one-dimensional (quasi-1D) crystalline structure. In this study, we identify the chain-like construction and anisotropic electronic states on TaNiTe ₅ surface with scanning tunneling microscopy. The electron scatterings are largely suppressed even with chromium impurities deposited on the surface and magnetic field applied normal to the surface, which endows TaNiTe ₅ great potential for low-dissipation spintronic applications.