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Positioning of strained islands by interaction with surface nanogrooves
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Katsaros, G., Tersoff, J., Stoffel, M., Rastelli, A., Acosta-Diaz, P., Kar, G. S., Costantini, Giovanni, Schmidt, O. and Kern, K. (2008) Positioning of strained islands by interaction with surface nanogrooves. Physical Review Letters, Vol.101 (No.9). article no.096103 . doi:10.1103/PhysRevLett.101.096103 ISSN 0031-9007.
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Official URL: http://dx.doi.org/10.1103/PhysRevLett.101.096103
Abstract
When strained Stranski-Krastanow islands are used as “self-assembled quantum dots,” a key goal is to control the island position. Here we show that nanoscale grooves can control the nucleation of epitaxial Ge islands on Si(001), and can drive lateral motion of existing islands onto the grooves, even when the grooves are very narrow and shallow compared to the islands. A position centered on the groove minimizes energy. We use as prototype grooves the trenches which form naturally around islands. During coarsening, the shrinking islands move laterally to sit directly astride that trench. In subsequent growth, we demonstrate that islands nucleate on the “empty trenches” which remain on the surface after complete dissolution of the original islands.
Item Type: | Journal Article | ||||
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Subjects: | Q Science > QC Physics | ||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry | ||||
Library of Congress Subject Headings (LCSH): | Germanium, Silicon, Quantum dots, Molecular beam epitaxy, Nanoscience | ||||
Journal or Publication Title: | Physical Review Letters | ||||
Publisher: | American Physical Society | ||||
ISSN: | 0031-9007 | ||||
Official Date: | 2008 | ||||
Dates: |
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Volume: | Vol.101 | ||||
Number: | No.9 | ||||
Number of Pages: | 4 | ||||
Page Range: | article no.096103 | ||||
DOI: | 10.1103/PhysRevLett.101.096103 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published |
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