Magneto-optical properties and exciton dynamics in Cd1-xMnxSe quantum dots and Cd1-xMnxTe/ZnTe quantum wells

Optical properties and dynamics of excitons are studied in the quantum-dot (QD) and quantum-well (QW) structures of diluted magnetic semiconductors with applying magnetic field. Microcrystals of Cd_1−xMn_xSe display a QD effect in the excitonic magnetic polaron state with an increased binding energy. The Cd_1−xMn_xTe/ZnTc QW system shows the exciton relaxation process in the picosecond time range, while the degenerate four-wave mixing study clarifies the two-component dephasing relaxations of the QW excitons, where the fast and slow components are caused by the free and localized excitons in the QWs. The observed magneto-optical effects and the dynamics are the particular properties of the diluted magnetic nanostructures.