Abstract
Ultrafast spin dynamics of excitons is studied in a double quantum well composed of Cd0.92Mn0.08Te and CdTe wells with a Cd0.80Mg0.20Te tunnel barrier, in magnetic fields, by pump-and-probe absorption spectroscopy. The excitonic injection process is clarified with the injection time of 30 ps from the Cd0.92Mn0.08Te spin aligner to the CdTe spin detector. The time dependencies of circularly polarized differential absorbances show directly the spin injection into the CdTe well. The spin relaxation of the injected excitons is observed as a function of energy in the exciton band of the CdTe well. In addition, ultrafast relaxation processes of spin-polarized carriers in the Cd0.78Mn0.05Mg0.17Te barrier are studied, when it is stacked directly with the CdTe well.
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