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 th e surface of a 3.5-ML-thick Cd1-xMnxTe layer revealed dot formation in a hi gh density of the order of 10(10)-10(11) cm(-2) when the Mn composition x w as 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. Th e 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].