Microwave-enhanced exciton delocalisation in low-dimensional CdTe/CdMnTe and CdMnTe/CdMgTe quantum well structures

In this work we describe new application of the technique of optically dete cted cyclotron resonance (ODCR) to the studies of localisation processes in quantum well structures of CdTe/CdMnTe and CdMnTe/CdMgTe. Interaction betw een microwave-heated free carriers. at cyclotron resonance conditions, and either site- or impurity-localised excitons results in modification of phot oluminescence from the sample. In consequence, cyclotron resonance of free carriers carl be detected optically. We show here that the technique of ODC R allows us to monitor processes of carrier/exciton localisation and also t o evaluate their influence on radiative recombination processes in quantum well structures. We conclude that localisation effects are crucial to expla in operation of CdTe/CdMnTe and CdMnTe/CdMgTe structures as light modulator s.