Single pair of Weyl fermions in the half-metallic semimetal [A Single Pair of Weyl Fermions in Half-metallic EuCd2As2 Semimetal]
Abstract
Materials with the ideal case of a single pair of Weyl points (WPs) are highly desirable for elucidating the unique properties of Weyl fermions. EuCd2As2 is an antiferromagnetic topological insulator or Dirac semimetal depending on the different magnetic configurations. Using first-principles band-structure calculations, we show that inducing ferromagnetism in EuCd2As2 can generate a single pair of WPs from splitting the single pair of antiferromagnetic Dirac points due to its half-metallic nature. Analysis with a low-energy effective Hamiltonian shows that a single pair of WPs is obtained in EuCd2As2 because the Dirac points are very close to the zone center and the ferromagnetic exchange splitting is large enough to push one pair of WPs to merge and annihilate at Γ while the other pair survives. As a result, we predict that alloying with Ba at the Eu site can stabilize the ferromagnetic configuration and generate a single pair of Weyl points without application of a magnetic field.
- Authors:
-
- Ames Lab., Ames, IA (United States)
- Iowa State Univ., Ames, IA (United States)
- Ames Lab. and Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Energy Frontier Research Centers (EFRC) (United States). Center for the Advancement of Topological Semimetals (CATS); Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1542945
- Alternate Identifier(s):
- OSTI ID: 1546278
- Report Number(s):
- IS-J-9874
Journal ID: ISSN 2469-9950; PRBMDO
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 99; Journal Issue: 24; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Wang, Lin -Lin, Jo, Na Hyun, Kuthanazhi, Brinda, Wu, Yun, McQueeney, Robert J., Kaminski, Adam, and Canfield, Paul C. Single pair of Weyl fermions in the half-metallic semimetal EuCd2As2 [A Single Pair of Weyl Fermions in Half-metallic EuCd2As2 Semimetal]. United States: N. p., 2019.
Web. doi:10.1103/PhysRevB.99.245147.
Wang, Lin -Lin, Jo, Na Hyun, Kuthanazhi, Brinda, Wu, Yun, McQueeney, Robert J., Kaminski, Adam, & Canfield, Paul C. Single pair of Weyl fermions in the half-metallic semimetal EuCd2As2 [A Single Pair of Weyl Fermions in Half-metallic EuCd2As2 Semimetal]. United States. https://doi.org/10.1103/PhysRevB.99.245147
Wang, Lin -Lin, Jo, Na Hyun, Kuthanazhi, Brinda, Wu, Yun, McQueeney, Robert J., Kaminski, Adam, and Canfield, Paul C. Sat .
"Single pair of Weyl fermions in the half-metallic semimetal EuCd2As2 [A Single Pair of Weyl Fermions in Half-metallic EuCd2As2 Semimetal]". United States. https://doi.org/10.1103/PhysRevB.99.245147. https://www.osti.gov/servlets/purl/1542945.
@article{osti_1542945,
title = {Single pair of Weyl fermions in the half-metallic semimetal EuCd2As2 [A Single Pair of Weyl Fermions in Half-metallic EuCd2As2 Semimetal]},
author = {Wang, Lin -Lin and Jo, Na Hyun and Kuthanazhi, Brinda and Wu, Yun and McQueeney, Robert J. and Kaminski, Adam and Canfield, Paul C.},
abstractNote = {Materials with the ideal case of a single pair of Weyl points (WPs) are highly desirable for elucidating the unique properties of Weyl fermions. EuCd2As2 is an antiferromagnetic topological insulator or Dirac semimetal depending on the different magnetic configurations. Using first-principles band-structure calculations, we show that inducing ferromagnetism in EuCd2As2 can generate a single pair of WPs from splitting the single pair of antiferromagnetic Dirac points due to its half-metallic nature. Analysis with a low-energy effective Hamiltonian shows that a single pair of WPs is obtained in EuCd2As2 because the Dirac points are very close to the zone center and the ferromagnetic exchange splitting is large enough to push one pair of WPs to merge and annihilate at Γ while the other pair survives. As a result, we predict that alloying with Ba at the Eu site can stabilize the ferromagnetic configuration and generate a single pair of Weyl points without application of a magnetic field.},
doi = {10.1103/PhysRevB.99.245147},
journal = {Physical Review B},
number = 24,
volume = 99,
place = {United States},
year = {Sat Jun 15 00:00:00 EDT 2019},
month = {Sat Jun 15 00:00:00 EDT 2019}
}
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