Abstract
The transition from two- to three-dimensional character of the exciton wave function is demonstrated in CdTe/Cd 0.75Mn 0.25Te single quantum wells or superlattices by resonance reflectivity measurements of the heavy-hole exciton oscillator strength as a function of the well width or period. A strong increase of the oscillator strength by a factor of 30 is found for 2D-excitons confined to 15 Å thick quantum wells. In thinner wells the oscillator strength decreases as a result of substantial penetration of the exciton wave function into the barrier layers. A similar nonmonotonic behaviour is observed in superlattices (SL) which indicates the formation of the electron miniband in periods less than 60 Å. A pronounced effect of an external magnetic field on the oscillator strength of Zeeman patterns is found in the short-period SLs signaling for the low-energy component a trend towards a type II SL transition.
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