Low-energy type-II Dirac fermions and spin-polarized topological surface states in transition-metal dichalcogenide NiTe${}_2$

Abstract

Using spin- and angle- resolved photoemission spectroscopy (spin-ARPES) together with $abinitio$ calculations, we demonstrate the existence of a type-II Dirac semimetal state in NiTe${}_2$. We show that, unlike PtTe${}_2$, PtSe${}_2$, and PdTe${}_2$, the Dirac node in NiTe${}_2$ is located in close vicinity of the Fermi energy. Additionally, NiTe${}_2$ also hosts a pair of band inversions below the Fermi level along the $\Gamma -A$ high-symmetry direction, with one of them leading to a Dirac cone in the surface states. The bulk Dirac nodes and the ladder of band inversions in NiTe${}_2$ support unique topological surface states with chiral spin texture over a wide range of energies. Our work paves the way for the exploitation of the low-energy type-II Dirac fermions in NiTe${}_2$ in the fields of spintronics, THz plasmonics and ultrafast optoelectronics.

4+ pages and 4 figures; minor revision

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