Abstract
We report theoretical and experimental evidence that in magnetic fields greater than 1.6 T applied along the 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 at the Fermi level when the Eu spins are fully aligned along the axis. Shubnikov–de Haas oscillations measured in fields parallel to reveal a cyclotron effective mass of and a Fermi surface of extremal area , corresponding to 0.1% of the area of the Brillouin zone. The small values of and are consistent with quasiparticles near a Weyl node. The identification of as a model Weyl semimetal opens the door to fundamental tests of Weyl physics.
- Received 27 February 2019
- Corrected 28 February 2020
DOI:https://doi.org/10.1103/PhysRevB.100.201102
©2019 American Physical Society
Physics Subject Headings (PhySH)
Corrections
28 February 2020
Correction: The name of the ninth author contained an error and has been fixed.