Emergence of Topological Nodal Lines and Type II Weyl Nodes in Strong Spin--Orbit Coupling System InNbX2(X=S,Se)

Abstract

Using first--principles density functional calculations, we systematically investigate electronic structures and topological properties of InNbX2 (X=S, Se). In the absence of spin--orbit coupling (SOC), both compounds show nodal lines protected by mirror symmetry. Including SOC, the Dirac rings in InNbS2 split into two Weyl rings. This unique property is distinguished from other dicovered nodal line materials which normally requires the absence of SOC. On the other hand, SOC breaks the nodal lines in InNbSe2 and the compound becomes a type II Weyl semimetal with 12 Weyl points in the Brillouin Zone. Using a supercell slab calculation we study the dispersion of Fermi arcs surface states in InNbSe2, we also utilize a coherent potential approximation to probe their tolernace to the surface disorder effects. The quasi two--dimensionality and the absence of toxic elements makes these two compounds an ideal experimental platform for investigating novel properties of topological semimetals.

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Cited by in corpus (10)

• Enhanced anisotropic superconductivity in the topological nodal-line semimetal InxTaS2
• Anisotropic gapping of topological Weyl rings in the charge-density-wave superconductor InxTaSe2
• Anisotropic superconductivity in topological crystalline metal Pb${}_{1/3}$TaS${}_2$ with multiple Dirac fermions
• Kramers nodal lines in intercalated TaS${}_2$ superconductors
• Classification of Weyl points and nodal lines based on magnetic point groups for spin-$\frac{1}{2}$ quasiparticles
• Delocalization of topological surface states by diagonal disorder in nodal loop semimetals
• Strong electron-phonon coupling in 3D tungsten nitride and coexistence of intrinsic superconductivity and topological nodal line in its 2D limit
• Fragile topology in nodal-line semimetal superconductors
• Two-dimensional Dirac semimetals with tunable edge states
• TopologicalNumbers.jl: A Julia package for topological number computation