Abstract
Optical tuning of electron concentration in a quantum well is realized in CdTe/(Cd,Mg)Te heterostructures. Effects governed by the exciton-electron interaction at low electron density are studied by use of photoluminescence and reflectivity in magnetic fields and under microwave radiation. Experimental manifestations of bound (negatively charged excitons) and unbound (combined exciton-cyclotron resonance) exciton-electron states are discussed.
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