Exciton dynamics in diluted magnetic II–VI semiconductor nanostructures

Abstract Dynamics of excitons is reported in the quantum-dot (QD) and quantum-well (QW) structures of diluted magnetic II–VI semiconductors studied by time-resolved luminescence and transient nonlinear optical spectroscopies. QDs of Cd 1− x Mn x Se show the excitonic magnetic polaron effect with an increased binding energy of 20 meV. In multiquantum wells double dephasing decays of the QW excitons are observed, where the fast and slow dephasing components are caused by the free and localized excitons in the QWs. In asymmetric double quantum wells of Cd 1− x Mn x Te/ZnTe system, tunneling processes of carriers and excitons are varied in the picosecond time range depending on the barrier widths. The observed ultrafast dynamics and the enhanced magnetic-polaron effect display the excitonic properties of the diluted magnetic II–VI nanostructures.