Abstract
AbstractWe study exciton magnetic polaron (EMP) formation in (Cd,Mn)Se/(Cd,Mg)Se diluted magnetic semiconductor quantum wells (QWs) using time‐resolved photoluminescence (PL). Magnetic field dependence of the transients allows us to separate the non‐magnetic and magnetic contributions of the exciton localization. We find binding energy of 18 meV and formation time of 500 ps for the EMP. We propose that long polaron formation time is related to auto‐localization process, accompanied with the squeezing of the heavy‐hole envelope wave function. This conclusion is supported by a strong reduction of the exciton radiative lifetime from 600 to 200 ps with increase of magnetic field.
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