Computer simulation of the non-uniform and anisotropic diamagnetic shift of electronic energy levels in double quantum dot molecules

Abstract

In this study we calculated the lowest energy states of electrons confined in an asymmetrical InAs/GaAs double lens-shaped quantum dot molecule in external magnetic field. Based on the effective three-dimensional one electronic-band Hamiltonian approximation (with the energy and position dependent electronic effective mass) the electronic energy states of the system were computed by non-linear iterative method using Comsol MultiPhysics package. Our description allows us to simulate the semiconductor quantum dot molecule in arbitrary directed magnetic field. Simulation results clearly show that the diamagnetic shifts of the electronic energy levels are anisotropic and non-uniform. Therefore we demonstrate an opportunity to dynamically manipulate electronic states not only by varying the magnitude but also changing the direction of the magnetic field. (C) 2010 Elsevier B. V. All rights reserved.