Coemergence of Dirac and multi-Weyl topological excitations in pnictide antiperovskites
Wen Fong Goh, Warren E. Pickett
DOI 10.1103/PhysRevB.98.125147 · Physical Review B
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Abstract
The relatively unexplored family of pnictide-based antiperovskites has been shown to harbor prospects for topological phases. Using the example of Ca3BiP, we demonstrate a cascade of phases as the initial cubic symmetry is broken successively. Initially a small-gap Z2 topological insulator, spin-orbit coupling leads to band re-ordering resulting in a topological semimetal phase. Compressive uniaxial (001) strain leads back to a small-gap Z2 topological insulator, with the expected gapless boundary modes. Tensile (001) strain leaves the system with a pair of Dirac points along (0,0,±k∘) pinning the Fermi level, producing an unusual double meniscus of connected Fermi arcs on the (100) and (010) surfaces. Finally, breaking time-reversal symmetry by an applied Zeeman field produces a new phase with a pair of multi-Weyl nodes (massive or massless depending on direction, conventionally called semi-Dirac in two-dimensional systems) simultaneous with a sister pair of Dirac modes along each ±kz axis, combining to pin the Fermi level in the close vicinity of these varied single-particle excitations.
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