THz Spectroscopy of Surface States in 3D Topological Insulators based on Strained High Mobility HgTe Films

摘要

Applying terahertz photogalvanic spectroscopy we demonstrate that topological surface states in strained mercury telluride films prevails even for such large thickness as 200 nm. We show that THz radiation give rise to cyclotron resonance assisted photocurrents in top and bottom surface of (001) and (013)-grown 3D TI.