Landau Level Spectroscopy of Dirac Electrons in a Polar Semiconductor with Giant Rashba Spin Splitting

Abstract

Optical excitations of BiTeI with large Rashba spin splitting have been studied in an external magnetic field ($B$) applied parallel to the polar axis. A sequence of transitions between the Landau levels (LLs), whose energies are in proportion to $\sqrt{B}$ were observed, being characteristic of massless Dirac electrons. The large separation energy between the LLs makes it possible to detect the strongest cyclotron resonance even at room temperature in moderate fields. Unlike in 2D Dirac systems, the magnetic field induced rearrangement of the conductivity spectrum is directly observed.

Accepted for publication in Physical Review Letters

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• Transport Signatures of Fermi Surface Topology Change in BiTeI
• Uniaxial stress controlled anisotropic Rashba effects and carriers-based currents in BiTeI monolayer semiconductor
• Landau level spectroscopy of PbSnSe topological crystalline insulator
• A broadband silicon quarter-wave retarder for far-infrared spectroscopic circular dichroism
• Limits of Validity of Rashba Model in BiTeI: A High-field Magneto-optical Study
• Landau level spectroscopy in current solid state physics