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(a) Atomic force image of one sample showing InAs quantum dots, some of which are elongated. Monolayer steps on the surface can be seen. (b) A detailed image of a single dot, indicated in (a), obtained using phase contrast imaging. Facets can barely be seen. (c) A cartoon of a typical weakly elongated dot. (d) A cross section of the height over the center of one dot. No plateau at the top can be seen.
Photoluminescence spectrum of one sample. A peak at originating from the dots can be seen as well as a peak from the InP substrate. The arrow indicates the calculated transition energy.
A plot of the band edges through the center of the dot. The direction of the plot is along (001). The strain situation and thus the energy levels are scale invariant with respect to the size of the dot.
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