Abstract
The photoinduced self-trapped exciton magnetic polaron (ST-EMP) in diluted magnetic semiconductors has been the subject of intensive investigations related to the observed photoluminescence during the last two decades. The stability, however, seems still controversial. In this article we study the stability of ST-EMP theoretically, including thermodynamic fluctuations of magnetization. The calculation suggests that the EMP in CdTe(Mn) (Mn: 10-20%) is not self-trapped except at low temperatures below ¨ 1 K, but the other primary localization mechanisms, for example, alloy potential fluctuations, are necessary to the localization of EMP above ¨ 1 K.
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