Density functional theory calculations of electronic structure in silicon double quantum dots

Abstract

AbstractThe finite difference method and anisotropic effective mass density functional theory (DFT) are used to calculate the electronic structure and wavefunctions of Silicon isolated double quantum dots. An optimised algorithm for determining the self‐consistent DFT potential was developed.The effects of applying electric fields to push the electrons from one dot to another dot in the double quantum dot are studied. We demonstrate that depending on the structure parameters there are two regimes corresponding to the strong and weak coupling between the two dots. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)