Free and localized positively charged excitons in the emission spectrum of GaAs/AlGaAs quantum wells

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Abstract
The recombination emission spectra of an excitonic complex (A0X) localized on a neutral acceptor, which have previously been attributed to a positively charged exciton (X+), are investigated. Satellites arising around the main luminescence line as a result of recoil processes during recombination of the complex which leave the surviving hole in an excited state are observed and investigated. It is shown in a computational model based on the Luttinger Hamiltonian that the energy splittings between the main line and the satellites correspond to an in-barrier impurity center located a definite distance from the well. It is shown that as the magnetic field increases, a transition is observed from the singlet ground state of the complex to a multiplet state.