Elsevier, Materials Science and Engineering: B, 2-3(88), p. 225-229
DOI: 10.1016/s0921-5107(01)00870-4
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A remarkable change in topology occurs when InyGa1−yAs quantum dots, grown by Stranski–Krastanov self-organization, are covered by a thin layer of GaAs. The nano-islands rearrange themselves to form volcano-like islands with distinct, ring-like features. The island topology can be preserved during overgrowth and thus used for the fabrication of ring-shaped quantum structures. The experimental data suggests that two mechanisms, diffusion and dewetting, are driving the transformation from dots to rings.