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XTEM micrograph of a 3-fold coupled QD structure (40 periods of CQD/Si stacks) (a). A magnified image of the dashed rectangular region in (a) for three selected CQDs near the top stack is shown in (b). Each CDQ is composed of Ge layers (three distinct dark regions shown in the right-hand image), whereas the two white areas corresponding to Si layers are inserted into the dot. Higher resolution image of CDQs is given in Supplementary Fig. S2.
