Momentum alignment and spin orientation of photoexcited electrons in GaAs in the transition from two- to three-dimensional structures

The effect of miniband formation in superlattices on the selection rules fo r optical transitions has been analyzed by studying the polarized hot elect ron luminescence (HEL). Two regions can be distinguished in the range of va riation of miniband parameters in superlattices, each characterized by its own selection rules. The specificity of the selection rules For each of the regions is manifested in the linear and circular polarization of the PL, t he distribution of photoexcited electrons over quasi-momenta, and the behav ior of photoelectrons in the magnetic field. (C) 2001 MAIK "Nauka/Interperi odica".