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1 Bulletin of the Polish Academy of Sciences. Chemistry

1 2000

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

Godlewski M., Ivanov V. Yu., Khachapuridze A.

Bulletin of the Polish Academy of Sciences. Chemistry

2000

Vol. 48, No. 4

346-354

In this work we descrjbe new application of the technique of optically detected cyclotron resonance (ODCR) to the studies of localisation processes in quantum well structures of CdTe/CdMnTe and CdMnTe/CdMgrre. Interaction between rnicrowave-eated free carriers, at cyclotron. resonance conditions, and either site- or impurity-localised excitons results in modificatjon of photoluminescence from the sample. In consequence, cyclotron resonance of free carriers can be detected optically. We show here that the tech-nique of ODCR allows us to monitor processes of carrier/exciton localisation and also to evaluate their influence on radiative recombination processes in quantum well structures. We conclude that localisation effects are crucial to explain operation of CdTe/CdMnTe and CdMnTe/CdMgTe structures as light modulators.