Coexistence of bound and localized exciton magnetic polarons in Cd 0.8Mn0.2Te

Abstract

Fundamental magneto-optical properties of single crystals of the semimagnetic semiconductor Cd0.8Mn0.2Te are carefully measured with the use of band-to-band excitation. Two new phenomena are presented: the peculiar magnetic field dependence of the magnetic polaron luminescence and the existence of two components for the polaron luminescence. Theoretical consideration with regard to the Zeeman effect ascribes the two components of luminescence to the exciton magnetic polaron spectrum and the neutral acceptor-bound exciton magnetic polaron spectrum. The calculated result for the luminescence peak positions is also consistent with the experimental result of the circularly polarized luminescence under the presence of an applied magnetic field. In other words, the σ+ luminescence is due to the exciton magnetic polaron, whereas the σ- luminescence is due to the neutral acceptor-bound exciton magnetic polaron. © IOP Publishing Ltd.