The band structure of solid state systems can exhibit linear like dispersions resembling the Dirac equation in high-energy physics; however, the crystal structure anisotropy typically associated with solid state systems can lead to deviations from the symmetry of the original equation. Here, using Landau level spectroscopy, the authors report experimental evidence for isotropic fermions in 3D crystal structure of LaAlSi.
- Zeping Shi
- Wenbin Wu
- Xiang Yuan
