Optical properties of doped quasi-two-dimensional systems

A wide class of experimental data on luminescence in doped two-dimensional systems is explained in terms of multiphonon optical transitions. A zero-radius-potential model is employed to describe localized states in square quantum wells. Specifically, it is shown that the luminescence intensity varies nonmonotonically with the acceptor-impurity position, whereas the half-width of the luminescence peak decreases with the impurity distance from the center of the size-confined system. The features of luminescence in a longitudinal magnetic field are investigated.