Fermi-crossing Type-II Dirac fermions and topological surface states in NiTe2

Abstract

Transition-metal dichalcogenides (TMDs) offer an ideal platform to experimentally realize Dirac fermions. However, typically these exotic quasiparticles are located far away from the Fermi level, limiting the contribution of Dirac-like carriers to the transport properties. Here we show that NiTe2 hosts both bulk Type-II Dirac points and topological surface states. The underlying mechanism is shared with other TMDs and based on the generic topological character of the Te p-orbital manifold. However, unique to NiTe2, a significant contribution of Ni d orbital states shifts the energy of the Type-II Dirac point close to the Fermi level. In addition, one of the topological surface states intersects the Fermi energy and exhibits a remarkably large spin splitting of 120 meV. Our results establish NiTe2 as an exciting candidate for next-generation spintronics devices.

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• Topological Type-II Dirac Fermions Approaching the Fermi Level in a Transition Metal Dichalcogenide NiTe2

Cited by in corpus (12)

• Strain-engineering the topological type-II Dirac semimetal NiTe${}_2$
• Emergent vortex Majorana zero mode in iron-based superconductors
• Observation of highly anisotropic bulk dispersion and spin-polarized topological surface states in CoTe2
• Controlling spin-orbit coupling to tailor type-II Dirac bands
• Hidden spin-orbital texture at the $\bar{\Gamma }$-located valence band maximum of a transition metal dichalcogenide semiconductor
• Interface superconductivity in a type-II Dirac semimetal NiTe${}_2$
• Tuning multiple Landau Quantization in Transition-Metal Dichalcogenide with Strain
• GW effects on the topology of type-II Dirac cones in NiTe${}_2$, PtSe${}_2$ and PtTe${}_2$
• Exploring Native Atomic Defects in NiTe2
• Fractional ac Josephson effect as evidence of topological hinge states in a Dirac semimetal NiTe2
• Spin-orbital mixing in the topological ladder of the two-dimensional metal PtTe${}_2$
• Designer three-dimensional electronic bands in asymmetric transition metal dichalcogenide heterostructures