Spatially separated indirect photoemission in undoped ZnSe/BeTe type-II quantum wells studied in pulse magnetic fields

Abstract

Spatially separated indirect photoemission in an undoped ZnSe/BeTe type-II quantum structure is investigated by applying pulse magnetic field up to 50 T. A method was applied to extract the intrinsic circular polarization degree from photoluminescence (PL) with strong in-plane anisotropy. The magnetic field dependences of the circularly dichroic PL are explained by an optical transition model associated with a positively charged exciton composed of an electron and two light holes. The positively charged exciton PL is strongly suppressed by the magnetic field and also by temperature.