Abstract
We report a pronounced effect of an additional hole confinement in the electron Coulomb potential on giant splitting and oscillator strength of the exciton Zeeman patterns in CdTe/${\mathrm{Cd}}_{0.75}$${\mathrm{Mn}}_{0.25}$Te quantum-well structures. Measuring oscillator strength and Zeeman splitting as a function of the quantum-well width and/or an external magnetic field by resonance reflection spectroscopy we demonstrate the transition from a hole subject to a net potential well to that confined to the electron Coulomb potential occurring in quantum wells thicker than 30 \AA{}. This transition is also found in superlattices where the electron wave function changes its character from three to two dimensional with an increase of the superlattice period. Analyzing the magneto-optical data taken above and below the transition, we conclude that an additional hole confinement reduces a hole wave-function penetration into semimagnetic barriers and decreases the strength of the exchange interaction of holes with magnetic ions.
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