ZEEMAN SPLITTING OF EXCITONS IN CDTE CDMNTE QUANTUM-WELLS/

We present a calculation of the Zeeman splitting of the light-and heav y-hole excitons that takes into account the uniaxial strain due to lat tice mismatch as well as the interface-enhanced paramagnetism. In the CdTe quantum well, the strain raises the light-hole band edge with res pect to the heavy-hole one. The shallower well allows a larger penetra tion of the Cd1-xMnxTe barrier region by the light hole. This adds to the effect of the lighter effective mass, leading to an ''anomalous'' enhancement of the Zeeman splitting of the light-hole exciton. We find that the ratio of the light-to heavy-hole exciton splitting (between the sigma(-) and sigma(+) components) increases with the quantum well width eventually exceeding unity, in agreement with experimental data. (C) 1998 Elsevier Science B.V. All rights reserved.