Tunable quantum coupling in a II-VI quantum dot molecule.

Single quantum dot molecules have been fabricated from coupled quantum well structures of (Cd, Mn, Mg) Te alloy materials using a selective interdiffusion technique. Incorporation of Mn ions in one of the quantum dots in the molecule results in pairs of quantum dots with markedly different spin splittings. By comparing the observed magnetic field dependence of the optical polarization in photoluminescence with detailed calculations, we show that the coupling between the dots is quantum mechanical tunnel coupling and that it is tunable. [ABSTRACT FROM AUTHOR]