Dissociation of vertical semiconductor diatomic artificial molecules - art. no. 066801

We investigate the dissociation of few-electron circular vertical semicondu ctor double quantum dot artificial molecules at 0 T as a function of interd ot distance. A slight mismatch introduced in the fabrication of the artific ial molecules from nominally identical constituent quantum wells induces lo calization by offsetting the energy levels in the quantum dots by up to 2 m eV, and this plays a crucial role in the appearance of the addition energy spectra as a function of coupling strength particularly in the weak couplin g limit.