We report a pronounced effect on an additional hole confinement in the electron Coulomb potential on giant splitting and oscillator strengths of the exciton Zeeman patterns in CdTe/(Cd,Mn)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 subjected to a net potential well to that confined to the electron Coulomb potential occurring in quantum wells thicker than 30 angstroms. 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 superlattices period. Analyzing the magnetooptical data taken above and below the transition we find the hole confinement in the electron Coulomb potential to decrease a hole wave function penetration into semimagnetic barriers to decrease the strength of the exchange interaction of holes with magnetic ions.

Date Published: 3 September 1992
PDF: 8 pages
Proc. SPIE 1675, Quantum Well and Superlattice Physics IV, (3 September 1992);

Published in SPIE Proceedings Vol. 1675:
Quantum Well and Superlattice Physics IV
Gottfried H. Doehler; Emil S. Koteles, Editor(s)