Spontaneous localization in InAs/GaAs self-assembled quantum-dot molecules

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Abstract
Spontaneous localization of hole states is predicted at all separations in vertically stacked InAs/GaAs self-assembledquantum dots. Eight-band k⋅p theory shows that valence bandmixing enhanced by the unique three-dimensional strain distribution, subjects holes to very different environment than electrons. As a result, low energy holes are confined to their respective dots without forming bonding or antibonding states. This localization plays the same role as a vertically applied electric field in coupled quantum systems, and substantially decreases the exciton binding energy, which may be an impediment to the formation of entangled states in quantum-dot molecules.