Spin-orbit coupling driven crossover from a starfruitlike nodal semimetal to Dirac and Weyl semimetal state in CaAuAs
Abstract
Band crossings that occur on a mirror plane are compelled to form nodal loops in the momentum space in the absence of spin-orbit coupling (SOC). When other equivalent mirror planes are present, multiple such nodal loops can combine to form interesting topological structures involving crossed nodal lines. Here, based on first-principles calculations and an effective k ⋅ p model analysis, we show that CaAuAs hosts a unique starfruitlike crossed-nodal-line structure in the bulk electronic dispersion, which is comprised of three nodal loops that cross each other at the time-reversal-invariant momentum point A. When the SOC is turned on, the nodal loops are gapped out, resulting in a stable Dirac semimetal state with a pair of Dirac points along the Γ−A direction in the Brillouin zone. These Dirac points are protected by the combination of time-reversal, inversion, and C3 rotation symmetries. Here we discuss how a systematic elimination of the symmetry constraints yields a Weyl semimetal and eventually a topological insulator state.
- Authors:
-
- Shenzhen University (China); Northeastern University, Boston, MA (United States)
- Indian Institute of Technology-Kanpur, Kanpur (India)
- Shenzhen University (China)
- Institute of Physics, Academia Sinica, Taipei (Taiwan)
- Northeastern University, Boston, MA (United States)
- Publication Date:
- Research Org.:
- Northeastern Univ., Boston, MA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); Shenzhen Peacock Plan; Science and Technology Planning Project of Guangdong Province; Educational Commission of Guangdong Province
- OSTI Identifier:
- 1540950
- Alternate Identifier(s):
- OSTI ID: 1463929
- Grant/Contract Number:
- FG02-07ER46352; AC02-05CH11231; 827-000113; KQTD2016053112042971; 2016B050501005; 2016KSTCX126
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B
- Additional Journal Information:
- Journal Volume: 98; Journal Issue: 8; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; topological materials; Dirac semimetal; node-line segments; Weyl semimetal; density functional theory; k dot p method
Citation Formats
Singh, Bahadur, Mardanya, Sougata, Su, Chenliang, Lin, Hsin, Agarwal, Amit, and Bansil, Arun. Spin-orbit coupling driven crossover from a starfruitlike nodal semimetal to Dirac and Weyl semimetal state in CaAuAs. United States: N. p., 2018.
Web. doi:10.1103/physrevb.98.085122.
Singh, Bahadur, Mardanya, Sougata, Su, Chenliang, Lin, Hsin, Agarwal, Amit, & Bansil, Arun. Spin-orbit coupling driven crossover from a starfruitlike nodal semimetal to Dirac and Weyl semimetal state in CaAuAs. United States. https://doi.org/10.1103/physrevb.98.085122
Singh, Bahadur, Mardanya, Sougata, Su, Chenliang, Lin, Hsin, Agarwal, Amit, and Bansil, Arun. Fri .
"Spin-orbit coupling driven crossover from a starfruitlike nodal semimetal to Dirac and Weyl semimetal state in CaAuAs". United States. https://doi.org/10.1103/physrevb.98.085122. https://www.osti.gov/servlets/purl/1540950.
@article{osti_1540950,
title = {Spin-orbit coupling driven crossover from a starfruitlike nodal semimetal to Dirac and Weyl semimetal state in CaAuAs},
author = {Singh, Bahadur and Mardanya, Sougata and Su, Chenliang and Lin, Hsin and Agarwal, Amit and Bansil, Arun},
abstractNote = {Band crossings that occur on a mirror plane are compelled to form nodal loops in the momentum space in the absence of spin-orbit coupling (SOC). When other equivalent mirror planes are present, multiple such nodal loops can combine to form interesting topological structures involving crossed nodal lines. Here, based on first-principles calculations and an effective k ⋅ p model analysis, we show that CaAuAs hosts a unique starfruitlike crossed-nodal-line structure in the bulk electronic dispersion, which is comprised of three nodal loops that cross each other at the time-reversal-invariant momentum point A. When the SOC is turned on, the nodal loops are gapped out, resulting in a stable Dirac semimetal state with a pair of Dirac points along the Γ−A direction in the Brillouin zone. These Dirac points are protected by the combination of time-reversal, inversion, and C3 rotation symmetries. Here we discuss how a systematic elimination of the symmetry constraints yields a Weyl semimetal and eventually a topological insulator state.},
doi = {10.1103/physrevb.98.085122},
journal = {Physical Review. B},
number = 8,
volume = 98,
place = {United States},
year = {Fri Aug 10 00:00:00 EDT 2018},
month = {Fri Aug 10 00:00:00 EDT 2018}
}
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