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We study the electronic and optical properties of laterally coupledInGaAs/GaAs quantum dot molecules under lateral electric field. We find thatelectrons perceive the double-dot structure as a compound single object, whilethe holes discern two well separated dots. Through a combination of predictiveatomistic modeling, detailed morphology studies, and single objectmicro-photoluminescence measurements, we show that this peculiar confinementresults in an unusual heterogeneous behavior of electrons and holes withprofound consequences on optical properties.

Heterogeneous confinement in laterally coupled InGaAs/GaAs quantum dot molecules under lateral electric fields