We report on optical reflectivity experiments performed on Cd3 As2 over a broad range of photon energies and magnetic fields. The observed response clearly indicates the presence of 3D massless charge carriers. The specific cyclotron resonance absorption in the quantum limit implies that we are probing massless Kane electrons rather than symmetry-protected 3D Dirac particles. The latter may appear at a smaller energy scale and are not directly observed in our infrared experiments.
Physical Review Letters
- Pub Date:
- September 2016
- Condensed Matter - Mesoscale and Nanoscale Physics;
- Condensed Matter - Materials Science;
- Condensed Matter - Other Condensed Matter
- 5 pages, 4 figures + supplementary materials (17 pages), to be published in Phys. Rev. Lett