Vertically coupled quantum dots in the local spin-density functional theory - art. no. 115316

We have investigated the structure of double quantum dots vertically couple d at zero magnetic field within local-spin-density functional theory. The d ots are identical and have a finite width, and the whole system is axially symmetric; We first discuss the effect of thickness on the addition spectru m of one single dot. Next we describe the structure of coupled dots as a fu nction of the interdot distance for different electron numbers. Addition sp ectra, Hund's rule, and molecular-type configurations are discussed. It is shown that self-interaction corrections to the density-functional results d o not play a very important role in the calculated addition spectra.