Direct observation of Landau level resonance and mass generation in Dirac semimetal Cd3As2 thin films

Understand

Three-dimensional topological Dirac semimetals have hitherto stimulated unprecedented research interests as a new class of quantum materials.

• Breaking certain types of symmetries has been proposed to enable the manipulation of Dirac fermions; and that was soon realized by external modulations such as magnetic fields.
• However, an intrinsic manipulation of Dirac states, which is more efficient and desirable, remains a significant challenge.
• Here, we report a systematic study of quasi-particle dynamics and band evolution in Cd3As2 thin films with controlled Chromium (Cr) doping by both magneto-infrared spectroscopy and electrical transport.