Fabrication and micro-photoluminescence study of CdMnTe diluted magnetic quantum dots

We report the growth of self assembled CdMnTe diluted magnetic quantum dots by molecular beam epitaxy. The Mn content within the dots can be efficiently controlled by the growth conditions. The presence of magnetic Mn ions in the zero-dimensional structures results in a strong enhancement of their spin related properties, in the giant Zeeman splitting of excitonic levels, in particular. The insight into these magnetic properties is obtained by means of micro-photoluminescence measurements at an external magnetic field. We study the evolution of several photoluminescence lines related to the emission from individual quantum dots at an external magnetic field. We determine an approximate number of magnetic ions inside the dots and the sizes of the dots by comparing these dependences to the model calculations.