We study the electronic and optical properties of laterally coupled InGaAs/GaAs quantum dot molecules under lateral electric field. We find that electrons perceive the double-dot structure as a compound single object, while the holes discern two well separated dots. Through a combination of predictive atomistic modeling, detailed morphology studies, and single object micro-photoluminescence measurements, we show that this peculiar confinement results in an unusual heterogeneous behavior of electrons and holes with profound consequences on optical properties.
@article{arxiv.0910.5138,
title = {Heterogeneous confinement in laterally coupled InGaAs/GaAs quantum dot molecules under lateral electric fields},
author = {Jie Peng and Claus Hermannstädter and Marcus Witzany and Matthias Heldmaier and Lijuan Wang and Suwit Kiravittaya and Armando Rastelli and Oliver G. Schmidt and Peter Michler and Gabriel Bester},
journal= {arXiv preprint arXiv:0910.5138},
year = {2012}
}