Non-trivial quasi-one-dimensional surface state in NbNiTex

By combining angle-resolved photoemission spectroscopy (ARPES), spin-resolved ARPES (SARPES), scanning tunnelling microscopy (STM) and first-principles calculations, we have studied the electronic band structure, atomic structure and spin polarization of a topological material candidate NbNiTex. Our high quality ARPES and SARPES results clearly show a quasi-one-dimensional Dirac-like surface state along Z ̅-Γ ̅-Z ̅ direction with spin polarization, which causes the appearance of quasi-one-dimensional open Fermi surface sheets on the top surface (the (010) surface). On the other hand, STM reveals that there are one dimensional atomic chains perpendicular to each other at different bias voltages. Our findings provide an interesting platform with 3D counterparts of quantum spin hall insulators, that may lead to innovative electronic and spintronic technologies.