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Sequence of STM micrographs taken in real time over the same region of interest, as a function of increasing coverage [(b)–(d)] of the -thick surface [shown in (a)] at . Note the position of the two huts in (a) and (b), and of the two huts in the bottom-left part of (b) and (c). (e) -capped surface at the completion of capping after a short anneal. (f) -capped surface after a prolonged anneal.
(a) Finite element model of case 5, where the -cap layer grows in a 2D fashion by wetting the wetting layer, embedding the huts in it. (b) Dependence of normalized energy, , on the configuration of the -cap layer. Cases 1 and 2: forms 3D huts of its own. Cases 3 and 4: sticks to the hut facets; Case 5 (reference): wets the layer, embedding the huts in it.
huts configurational energies, , for 5, 10, and ML’s, as calculated by summing the surface and the FE-calculated elastic, , terms.
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