FREE AND LOCALIZED POSITIVELY CHARGED EXCITONS IN THE EMISSION-SPECTRUM OF GAAS ALGAAS QUANTUM-WELLS/

The recombination emission spectra of an excitonic complex (A(0)X) loc alized on a neutral acceptor, which have previously been attributed to a positively charged exciton (X+), are investigated. Satellites arisi ng around the main luminescence line as a result of recoil processes d uring recombination of the complex which leave the surviving hole in a n excited state are observed and investigated. It is shown in a comput ational model based on the Luttinger Hamiltonian that the energy split tings between the main line and the satellites correspond to an in-bar rier impurity center located a definite distance from the well. It is shown that as the magnetic field increases, a transition is observed f rom the singlet ground state of the complex to a multiplet state. (C) 1998 American Institute of Physics.