npj Quantum Materials (May 2023)

Robust three-dimensional type-II Dirac semimetal state in SrAgBi

  • Zhixiang Hu,
  • Junze Deng,
  • Hang Li,
  • Michael O. Ogunbunmi,
  • Xiao Tong,
  • Qi Wang,
  • David Graf,
  • Wojciech Radoslaw Pudełko,
  • Yu Liu,
  • Hechang Lei,
  • Svilen Bobev,
  • Milan Radovic,
  • Zhijun Wang,
  • Cedomir Petrovic

DOI
https://doi.org/10.1038/s41535-023-00549-8
Journal volume & issue
Vol. 8, no. 1
pp. 1 – 7

Abstract

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Abstract Topological semimetals such as Dirac, Weyl or nodal line semimetals are widely studied for their peculiar properties including high Fermi velocities, small effective masses and high magnetoresistance. When the Dirac cone is tilted, exotic phenomena could emerge whereas materials hosting such states are promising for photonics and plasmonics applications. Here we present evidence that SrAgBi is a spin-orbit coupling-induced type-II three-dimensional Dirac semimetal featuring tilted Dirac cone at the Fermi energy. Near charge compensation and Fermi surface characteristics are not much perturbed by 7% of vacancy defects on the Ag atomic site, suggesting that SrAgBi could be a material of interest for observation of robust optical and spintronic topological quantum phenomena.