Magneto-optical studies of chiral 2D hybrid perovskites.

We have used a number of cw optical techniques for studying films of chiral 2D hybrid organic inorganic perovskites. These spectroscopies include circular dichroism (CD) and magneto-CD, Faraday rotation, circularly polarized photoluminescence (CPL), circular photogalvanic effect (CPGE), and electro-absorption. We found that all spectra contain sizable contributions from both excitons and interband transition, from which the exciton binding energy can be derived. In particular from the CPGE excitation spectrum we obtained the Rashba splitting energy. We also found that the CPL increases substantially at low temperature, in accordance with the CD spectrum.