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(Color online) Large scale filled states image of sample A showing the three QD layers in which CL1 is 1.5, 2.5, and thick in (a), (b), and (c), respectively. The growth direction is from right to left. and .
Current image of a QD in sample B corresponding to layer 2 . Part of a second QD appears on the right and a shallow trench is clearly observed between the two QDs. , and .
(Color online) Topography image of three QDs in sample C corresponding to (a) layer 1 , (b) layer 3 , and (c) layer 4 . CL1 appears as a dark region between the WL and CL2. The bright spots are As atoms in the matrix. and .
(Color online) Average QD height in each layer as a function of the nominal thickness of CL1 for the three analyzed samples. The error is taken as the distance to the maximum and minimum values that were measured. The solid curve represents the ideal situation where the dot height corresponds exactly to the thickness of CL1. A significant deviation is observed for thick first capping layers.
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