Coemergence of Dirac and multi-Weyl topological excitations in pnictide antiperovskites

Goh, Wen Fong; Pickett, Warren E.

doi:10.1103/physrevb.98.125147

Title: Coemergence of Dirac and multi-Weyl topological excitations in pnictide antiperovskites

Journal Article · Fri Sep 28 00:00:00 EDT 2018 · Physical Review B

DOI:https://doi.org/10.1103/physrevb.98.125147· OSTI ID:1544202

Goh, Wen Fong ^[1]; Pickett, Warren E. ^[1]

Univ. of California, Davis, CA (United States)

The relatively unexplored family of pnictide-based antiperovskites has been shown to harbor prospects for topological phases. Using the example of Ca₃BiP, in this work 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_o ) 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 ±k_z axis, combining to pin the Fermi level in the close vicinity of these varied single-particle excitations.

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Research Organization:: Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC); National Science Foundation (NSF)

Grant/Contract Number:: DMR-1534719; AC02-05CH11231

OSTI ID:: 1544202

Alternate ID(s):: OSTI ID: 1474758

Journal Information:: Physical Review B, Vol. 98, Issue 12; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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