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Schematic picture of a double QD used for simulation.
The electron-hole wave-function overlap squared for the (black) and (red) hole states. The data are expressed in unit , where is the matrix element for a single QD.
Spatial distribution of the hole (green) and electron (red) wave functions along the vertical symmetry axis of the dots (the axis) for a single-dot and three selected double-dot structures. As a typical example of the hole states, we depict the HH component calculated using a model. The shaded regions correspond to Ge pyramids and wetting layers. The origin of the horizontal coordinates corresponds to the lower boundary of the lowest Ge wetting layer.
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