GIANT PHOTOINDUCED EXCITONIC FARADAY-ROTATION IN CDTE CD1-XMNXTE MULTIPLE-QUANTUM WELLS/

We report a giant photoinduced Faraday rotation in a CdTe/Cd1-xMnxTe m ultiple quantum well structure when the laser frequency is tuned close to the fundamental excitonic transition of the quantum well and satur ation sets in. At the same time we observe stimulated emission and bui ldup of magnetization through photon spin recycling in the presence of a magnetic field which was analyzed by a time-resolved linearly polar ized pump and probe technique. The magnetization buildup is also seen in the absence of the seeding magnetic field and by using a circularly polarized pump beam.