Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 20, Pages 4641-4644Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4641
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Three-dimensional islanding is generally assumed to proceed through nucleation and growth. Here we present studies showing the growth of Si1-xGex islands (0.2 < x < 0.6) without nucleation. Rather, a strain-driven growth instability induces a network of elevated cells, where the angle of elevation self-limits when {105} facets form pyramidal islands. These strain-modulated surfaces may serve as a template for the spatially controlled growth of quantum dot ensembles.
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