Influence of mismatch on the addition energy spectra of vertical diatomic artificial molecules

We investigate the dissociation of few-electron circular vertical semiconductor double quantum dot artificial molecules at View the MathML source as a function of interdot distance. Slight mismatch introduced in the fabrication of the artificial molecules from materials with nominally identical constituent quantum wells induces localization. This offsets the energy levels in the quantum dots by up to View the MathML source, and can play a crucial role in the appearance of the addition energy spectra as a function of coupling strength particularly in the weak coupling limit.