Abstract
We report on the measurements of charged (X—) and neutral (X) exciton cw photoluminescence (PL) in a magnetic field as a function of the electron concentration and carrier g-factors. We observe a strong influence of both of these parameters on the circular polarization degree of PL in remotely doped Cd1—xMnxTe/Cd1—yMgyTe quantum wells (QWs). To explain these polarization properties, the processes that lead to a dynamical equilibrium among trions, excitons and electron gas must be taken into account. This is in contrast to absorption experiments where the polarization of charged excitons is governed only by the occupation of spin-split conduction band states. We develop a rate equation model involving characteristic times as obtained from time resolved experiments. The model is capable to describe adequately our PL polarization results.
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