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Ideal Weyl semimetal induced by magnetic exchange

DOI: 10.1103/PhysRevB.100.201102 DOI Help

Authors: J.-r. Soh (University of Oxford) , F. De Juan (University of Oxford; Donostia International Physics Center; IKERBASQUE, Basque Foundation for Science) , M. G. Vergniory (Donostia International Physics Center; IKERBASQUE, Basque Foundation for Science) , N. B. M. Schröter (Paul Scherrer Institute) , M. C. Rahn (University of Oxford) , D. Y. Yan (Institute of Physics, Chinese Academy of Sciences) , J. Jiang (University of Oxford; ShanghaiTech University; Advanced Light Source) , M. Bristow (University of Oxford) , P. A. Reiss (University of Oxford) , J. N. Blandy (University of Oxford) , Y. F. Guo (ShanghaiTech University; CAS Center for Excellence in Superconducting Electronics (CENSE)) , Y. G. Shi (Institute of Physics, Chinese Academy of Sciences) , T. K. Kim (Diamond Light Source) , A. Mccollam (Radboud University) , S. H. Simon (University of Oxford) , Y. Chen (University of Oxford; ShanghaiTech University) , A. I. Coldea (University of Oxford) , A. T. Boothroyd (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review B , VOL 100

State: Published (Approved)
Published: November 2019
Diamond Proposal Number(s): 19234 , 18786

Abstract: We report theoretical and experimental evidence that EuCd 2 As 2 in magnetic fields greater than 1.6 T applied along the c axis is a Weyl semimetal with a single pair of Weyl nodes. Ab initio electronic structure calculations, verified at zero field by angle-resolved photoemission spectra, predict Weyl nodes with wave vectors k = ( 0 , 0 , ± 0.03 ) × 2 π / c at the Fermi level when the Eu spins are fully aligned along the c axis. Shubnikov–de Haas oscillations measured in fields parallel to c reveal a cyclotron effective mass of m ∗ c = 0.08 m e and a Fermi surface of extremal area A ext = 0.24 nm − 2 , corresponding to 0.1% of the area of the Brillouin zone. The small values of m ∗ c and A ext are consistent with quasiparticles near a Weyl node. The identification of EuCd 2 As 2 as a model Weyl semimetal opens the door to fundamental tests of Weyl physics.

Journal Keywords: Magnetic order; Topological materials Weyl fermions; Single crystal materials; Angle-resolved photoemission spectroscopy; Density functional theory; Hubbard model; Shubnikov-de Haas effect

Subject Areas: Physics, Materials


Instruments: I05-ARPES , I11-High Resolution Powder Diffraction