Magneto-optics of layers of triple quantum dot molecules

Abstract

We consider theoretically the impact of the coherent manipulation of electronic states in the triple vertical lens-shaped circular InAs/GaAs quantum dot molecules on the collective magneto-optical reflection from layers of those nano-objects. The quantum dots have substantially different diameters in contrast to most of the known simulations. We demonstrate a possibility to drive molecular electronic ground states (to redistribute electronic wave functions within the molecule) by applying an external magnetic field along the system's growth direction. The change in the states leads to the redistribution of the intensity of the reflectance and absorbance peaks in the collective magneto-optical response of a layer of the triple quantum dot molecules. Varying the distance between quantum dots within the layer one can study optically the transition from "molecular" to "atomic" configuration. We show that the changes in the quantum mechanical behaviour of the molecules can be made observable by monitoring changes of the ellipsometric parameters Psi and Delta in the magneto-optical response of layers of such nano-objects. (C) 2009 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim