Single pair of Weyl fermions in the half-metallic semimetal EuCd2As2 [A Single Pair of Weyl Fermions in Half-metallic EuCd2As2 Semimetal]

Wang, Lin -Lin; Jo, Na Hyun; Kuthanazhi, Brinda; Wu, Yun; McQueeney, Robert J.; Kaminski, Adam; Canfield, Paul C.

doi:10.1103/PhysRevB.99.245147

Title: Single pair of Weyl fermions in the half-metallic semimetal $EuC d_{2} A s_{2}$ [A Single Pair of Weyl Fermions in Half-metallic EuCd₂As₂ Semimetal]

Journal Article · Sat Jun 15 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.99.245147· OSTI ID:1542945

Wang, Lin -Lin ^[1]; Jo, Na Hyun ^[2]; Kuthanazhi, Brinda ^[2]; Wu, Yun ^[2]; McQueeney, Robert J. ^[3]; Kaminski, Adam ^[3]; Canfield, Paul C. ^[3]

Ames Lab., Ames, IA (United States)
Iowa State Univ., Ames, IA (United States)
Ames Lab. and Iowa State Univ., Ames, IA (United States)

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.

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Research Organization:: Energy Frontier Research Centers (EFRC) (United States). Center for the Advancement of Topological Semimetals (CATS); Ames Lab., Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1542945

Alternate ID(s):: OSTI ID: 1546278

Report Number(s):: IS-J-9874; PRBMDO

Journal Information:: Physical Review B, Vol. 99, Issue 24; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 58 works

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Title: Single pair of Weyl fermions in the half-metallic semimetal EuC d 2 A s 2 [A Single Pair of Weyl Fermions in Half-metallic EuCd2As2 Semimetal]

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Title: Single pair of Weyl fermions in the half-metallic semimetal $EuC d_{2} A s_{2}$ [A Single Pair of Weyl Fermions in Half-metallic EuCd₂As₂ Semimetal]