We report on stacked multiple quantum dots (QDs) formed inside inverted pyramidal recesses, which allow for the precise positioning of the QDs themselves. Specifically we fabricated double QDs with varying inter-dot distance and ensembles with more than two nominally highly symmetric QDs. For each, the effect of the interaction between QDs is studied by characterizing a large number of QDs through photoluminescence spectroscopy. A clear red-shift of the emission energy is observed together with a change in the orientation of its polarization, suggesting an increasing interaction between the QDs. Finally we show how stacked QDs can help influencing the charging of the excitonic complexes.
@article{arxiv.1708.09758,
title = {Statistical study of stacked/coupled site-controlled pyramidal quantum dots and their excitonic properties},
author = {S. T. Moroni and T. H. Chung and G. Juska and A. Gocalinska and E. Pelucchi},
journal= {arXiv preprint arXiv:1708.09758},
year = {2017}
}