Self-organized formation and photoluminescence of Cd1-xMnxTe quantum dots grown on ZnTe by atomic layer epitaxy

Self-organized quantum dots (QDs) of Cd1-xMnxTe were grown on the ZnTe(100) surface by atomic layer epitaxy. Atomic force microscope measurement on the surface of a 3.5-ML-thick Cd1-xMnxTe layer revealed dot formation in a high density of the order of 10(10)-10(11) cm(-2) when the Mn composition x was less than 10%. The typical dot size was given approximately by 20 nm in diameter and 2 nm in height. In photoluminescence (PL) measurements on the capped QDs, the excitonic emissions from the QDs were observed at 2.16-2.27 eV in the range of Mn composition x=0%-10%. The PL spectra from Cd1-xMnxTe QDs with x=0.6%-10.2% consisted of two lines separated by about 20 meV. The dependence of the PL energies on the Mn composition and the Zeeman shift were compared with the calculation. (C) 2000 American Institute of Physics. [S0003-6951(00)04317-5].