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(Color online) Schematic representation of the dependence of the surface elastic energy upon the spacer thickness. The cross sections of samples with different spacer thickness (a)–(c) are combined into a single cross section (d).
(Color online) Elastic strain field of one single pointlike inclusion (a) and a periodic array of point defects [(b)–(d)] in a GaAs matrix. (a) and (c) show the minima (black) and maxima (white) of the elastic energy per unit area in the  direction of the relaxed surface vs spacer thickness . (c) shows additionally in color coding. The density plot (b) depicts in the - surface plane at . (d) for and . The positions of the QDs are indicated by triangles [(a),(c), and (d)] and by boxes (b), respectively. All lengths are in units of the lattice constant of the parent material (monolayer width).
(Color online) Elastic strain field of a periodic array of pyramids in a GaAs matrix. (a) Density plot of the elastic energy per unit area in the - surface plane at (inset: 3D view). (b) Minima (black), maxima (white), and absolute values (color coded) of in the  direction of the relaxed surface vs spacer thickness . (c) for and . The positions and sizes of the QDs are indicated by boxes (a) and dotted triangles [(b) and (c)].
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