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Spatial regularity of InAs-GaAs quantum dots : quantifying the dependence of lateral ordering on growth rate
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Konishi, T., Clarke, E., Burrows, Christopher W., Bomphrey, John James, Murray, R. and Bell, Gavin R. (2017) Spatial regularity of InAs-GaAs quantum dots : quantifying the dependence of lateral ordering on growth rate. Scientific Reports, 7 . 42606 . doi:10.1038/srep42606 ISSN 2045-2322.
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Official URL: http://doi.org/10.1038/srep42606
Abstract
The lateral ordering of arrays of self-assembled InAs-GaAs quantum dots (QDs) has been quantified as a function of growth rate, using the Hopkins-Skellam index (HSI). Coherent QD arrays have a spatial distribution which is neither random nor ordered, but intermediate. The lateral ordering improves as the growth rate is increased and can be explained by more spatially regular nucleation as the QD density increases. By contrast, large and irregular 3D islands are distributed randomly on the surface. This is consistent with a random selection of the mature QDs relaxing by dislocation nucleation at a later stage in the growth, independently of each QD’s surroundings. In addition we explore the statistical variability of the HSI as a function of the number N of spatial points analysed, and we recommend N > 103 to reliably distinguish random from ordered arrays.
| Item Type: | Journal Article | ||||||||
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| Subjects: | Q Science > QC Physics | ||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Chemistry Faculty of Science, Engineering and Medicine > Science > Physics |
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| Library of Congress Subject Headings (LCSH): | Quantum dots., Molecular beam epitaxy. | ||||||||
| Journal or Publication Title: | Scientific Reports | ||||||||
| Publisher: | Nature Publishing Group | ||||||||
| ISSN: | 2045-2322 | ||||||||
| Official Date: | 13 February 2017 | ||||||||
| Dates: |
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| Volume: | 7 | ||||||||
| Article Number: | 42606 | ||||||||
| DOI: | 10.1038/srep42606 | ||||||||
| Status: | Peer Reviewed | ||||||||
| Publication Status: | Published | ||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||
| Date of first compliant deposit: | 22 December 2016 | ||||||||
| Date of first compliant Open Access: | 30 March 2017 | ||||||||
| Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||||
| Grant number: | GR/S05762/01 | ||||||||
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