Coemergence of Dirac and multi-Weyl topological excitations in pnictide antiperovskites
Abstract
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,±ko ) 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.
- Authors:
-
- Univ. of California, Davis, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF)
- OSTI Identifier:
- 1544202
- Alternate Identifier(s):
- OSTI ID: 1474758
- Grant/Contract Number:
- DMR-1534719; AC02-05CH11231
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 12; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Goh, Wen Fong, and Pickett, Warren E. Coemergence of Dirac and multi-Weyl topological excitations in pnictide antiperovskites. United States: N. p., 2018.
Web. doi:10.1103/physrevb.98.125147.
Goh, Wen Fong, & Pickett, Warren E. Coemergence of Dirac and multi-Weyl topological excitations in pnictide antiperovskites. United States. https://doi.org/10.1103/physrevb.98.125147
Goh, Wen Fong, and Pickett, Warren E. Fri .
"Coemergence of Dirac and multi-Weyl topological excitations in pnictide antiperovskites". United States. https://doi.org/10.1103/physrevb.98.125147. https://www.osti.gov/servlets/purl/1544202.
@article{osti_1544202,
title = {Coemergence of Dirac and multi-Weyl topological excitations in pnictide antiperovskites},
author = {Goh, Wen Fong and Pickett, Warren E.},
abstractNote = {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,±ko ) 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.},
doi = {10.1103/physrevb.98.125147},
journal = {Physical Review B},
number = 12,
volume = 98,
place = {United States},
year = {Fri Sep 28 00:00:00 EDT 2018},
month = {Fri Sep 28 00:00:00 EDT 2018}
}
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Metal-Rich Ternary Perovskite Nitrides: Metal-Rich Ternary Perovskite Nitrides
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