Magneto-photoluminescence from self-organized quantum dots of Cd1-xMnxTe grown by molecular beam epitaxy

Photoluminescence (PL) studies of self-organized quantum dots (QDs) of Cd1- xMnxTe under magnetic fields were reported. Cd1-xMnxTe QDs were grown succe ssfully in the composition range of x = 0-10% on the ZnTe(1 0 0) surface by MBE. The PL spectra from capped Cd1-xMnxTe QDs were composed of two lines with a separation of about 20 meV at low temperatures. In the dependence on the temperature and magnetic field, the PL line in the lower-energy side e xhibited peculiar behaviors, compared to that in the higher-energy side; wi th increasing temperature, the intensity of the lower-energy line was reduc ed rapidly and almost disappeared above 20 K, and Zeeman shift under magnet ic fields was smaller and the degree of the circular polarization was large r and saturated at low magnetic fields. These features of the lower-energy line were discussed in relation to excitonic magnetic polaron in QDs. (C) 2 000 Published by Elsevier Science B.V. All rights reserved.