Density functional theory application to double quantum dots: influence of mismatch on the addition energy spectra of vertical diatomic artificial molecules

摘要

Local spin density functional theory calculations for double quantum dots are compared with experimental data to explain the evolution of addition energy spectra with the interdot distance. Realistic features such as finite thickness and nonidentical constituent dots are included in the calculation. We can thus evaluate the heteronuclear character of the diatomic artificial quantum molecules due to a small unavoidable mismatch introduced in their fabrication.