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/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 Å. 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.
- Received 28 April 1992
DOI:https://doi.org/10.1103/PhysRevB.46.9788
©1992 American Physical Society