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Bright-field cross-sectional TEM micrograph showing AlN/GaN QD superlattice structure. The inset high-resolution image taken on the [112_0] zone axis shows the truncated pyramidal GaN QD shape.
(Color online) (a) Phase and (b) amplitude, images calculated from the reconstructed hologram of wurzite GaN QD, with base diameter of 23 nm and height of 3.75 nm.
(Color online) (a) Comparison of phase profiles across the center of GaN QD and across the GaN wetting layer and (b) Difference in phase profiles showing the relative phase shift caused by the GaN QD.
(Color online) (a) Schematic showing QD profile; (b) Schematic showing relevant dimensions of pyramidal QD; (c) Potential profile across center of GaN QD.
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