Local photoluminescence in InAs/GaAs heterostructures with quantum dots and artificial molecules

The use of QDs as a basis for new optoelectronic devices is very promising, due to a long electron lifetime at their excited levels. Therefore the inter- and intraband light absorption studies in QDs are useful not only for investigations of photodetectors but they also are the necessary condition of the development of new types of mid-infrared lasers. The preliminary results of experimental and theoretical studies of the optical phenomena in n- and p-doped InAs/GaAs QDs and artificial molecules formed by pairs of QDs are presented.