Addition spectra of quantum dots: the role of dielectric mismatch

Using atomistic pseudopotential wave functions, we calculate the electron a nd hole addition energies and the quasi-particle gap of InAs quantum dots. We find that the addition energies and the quasi-particle gap depend strong ly on the dielectric constant epsilon(out) of the surrounding material, and that when epsilon(out) is much smaller than the dielectric constant of the dot the electron-electron and hole-hole interactions are dominated by surf ace polarization effects. We predict the addition energies and the quasi-pa rticle gap as a function of size and epsilon(out), and compare our results with recent single-dot tunneling spectroscopy experiments.