Growth and micro‐luminescence from diluted magnetic quantum dots

Abstract

AbstractCdTe quantum dots containing magnetic Mn‐ions are grown by molecular beam epitaxy. The Mn content is varied by changing the growth conditions from about 3% to 0.04%. The presence of the magnetic impurities inside the quantum dots results in the giant Zeeman splitting of excitonic levels. Direct insight into magnetic properties of these structures is obtained by the micro‐photoluminescence at an external magnetic field. A careful analysis of the spectral position, the shape and the polarization of emission lines from individual quantum dots reveals a paramagnetic character of Mn ions and provides with a tool to obtain information about the average Mn concentration and the approximate number of Mn‐ions inside dots. Quantum dots with the number of Mn ions of the order of 100 are found in the sample with Mn content of 3% and with only 1 or 0 Mn ions in the sample with 0.04% (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)