Temperature Activated Dimensionality Crossover in the Nucleation of Quantum Dots by Droplet Epitaxy on GaAs(111)A Vicinal Substrates

A temperature activated crossover between two nucleation regimes is observed in the behavior of Ga droplet nucleation on vicinal GaAs(111)A substrates with a miscut of 2° towards [Formula: see text] . At low temperature (<400 °C) the droplet density dependence on temperature and flux is compatibl...

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Autores principales: Tuktamyshev, Artur, Fedorov, Alexey, Bietti, Sergio, Tsukamoto, Shiro, Sanguinetti, Stefano
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2019
Materias:
Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6787194/
https://www.ncbi.nlm.nih.gov/pubmed/31601913
http://dx.doi.org/10.1038/s41598-019-51161-5
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author Tuktamyshev, Artur
Fedorov, Alexey
Bietti, Sergio
Tsukamoto, Shiro
Sanguinetti, Stefano
author_facet Tuktamyshev, Artur
Fedorov, Alexey
Bietti, Sergio
Tsukamoto, Shiro
Sanguinetti, Stefano
author_sort Tuktamyshev, Artur
collection PubMed
description A temperature activated crossover between two nucleation regimes is observed in the behavior of Ga droplet nucleation on vicinal GaAs(111)A substrates with a miscut of 2° towards [Formula: see text] . At low temperature (<400 °C) the droplet density dependence on temperature and flux is compatible with droplet nucleation by two-dimensional diffusion. Increasing the temperature, a different regime is observed, whose scaling behavior is compatible with a reduction of the dimensionality of the nucleation regime from two to one dimension. We attribute such behavior to a presence of finite width terraces and a sizeable Ehrlich-Schwöbel barrier at the terrace edge, which hinders adatom diffusion in the direction perpendicular to the steps.
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spelling pubmed-67871942019-10-17 Temperature Activated Dimensionality Crossover in the Nucleation of Quantum Dots by Droplet Epitaxy on GaAs(111)A Vicinal Substrates Tuktamyshev, Artur Fedorov, Alexey Bietti, Sergio Tsukamoto, Shiro Sanguinetti, Stefano Sci Rep Article A temperature activated crossover between two nucleation regimes is observed in the behavior of Ga droplet nucleation on vicinal GaAs(111)A substrates with a miscut of 2° towards [Formula: see text] . At low temperature (<400 °C) the droplet density dependence on temperature and flux is compatible with droplet nucleation by two-dimensional diffusion. Increasing the temperature, a different regime is observed, whose scaling behavior is compatible with a reduction of the dimensionality of the nucleation regime from two to one dimension. We attribute such behavior to a presence of finite width terraces and a sizeable Ehrlich-Schwöbel barrier at the terrace edge, which hinders adatom diffusion in the direction perpendicular to the steps. Nature Publishing Group UK 2019-10-10 /pmc/articles/PMC6787194/ /pubmed/31601913 http://dx.doi.org/10.1038/s41598-019-51161-5 Text en © The Author(s) 2019 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.
spellingShingle Article
Tuktamyshev, Artur
Fedorov, Alexey
Bietti, Sergio
Tsukamoto, Shiro
Sanguinetti, Stefano
Temperature Activated Dimensionality Crossover in the Nucleation of Quantum Dots by Droplet Epitaxy on GaAs(111)A Vicinal Substrates
title Temperature Activated Dimensionality Crossover in the Nucleation of Quantum Dots by Droplet Epitaxy on GaAs(111)A Vicinal Substrates
title_full Temperature Activated Dimensionality Crossover in the Nucleation of Quantum Dots by Droplet Epitaxy on GaAs(111)A Vicinal Substrates
title_fullStr Temperature Activated Dimensionality Crossover in the Nucleation of Quantum Dots by Droplet Epitaxy on GaAs(111)A Vicinal Substrates
title_full_unstemmed Temperature Activated Dimensionality Crossover in the Nucleation of Quantum Dots by Droplet Epitaxy on GaAs(111)A Vicinal Substrates
title_short Temperature Activated Dimensionality Crossover in the Nucleation of Quantum Dots by Droplet Epitaxy on GaAs(111)A Vicinal Substrates
title_sort temperature activated dimensionality crossover in the nucleation of quantum dots by droplet epitaxy on gaas(111)a vicinal substrates
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6787194/
https://www.ncbi.nlm.nih.gov/pubmed/31601913
http://dx.doi.org/10.1038/s41598-019-51161-5
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