We investigated the nucleation of Ga droplets on singular GaAs(111)A substrates in the view of their use as the seeds for the self-assembled droplet epitaxial quantum dots. A small critical cluster size of 1–2 atoms characterizes the droplet nucleation. Low values of the Hopkins-Skellam index (as low as 0.35) demonstrate a high degree of a spatial order of the droplet ensemble. Around 350∘C the droplet size distribution becomes bimodal. We attribute this observation to the interplay between the local environment and the limitation to the adatom surface diffusion introduced by the Ehrlich–Schwöbel barrier at the terrace edges.

Tuktamyshev, A., Fedorov, A., Bietti, S., Vichi, S., Tambone, R., Tsukamoto, S., et al. (2021). Nucleation of Ga droplets self-assembly on GaAs(111)A substrates. SCIENTIFIC REPORTS, 11(1) [10.1038/s41598-021-86339-3].

Nucleation of Ga droplets self-assembly on GaAs(111)A substrates

Tuktamyshev, Artur
Primo
;
Fedorov, Alexey;Bietti, Sergio;Vichi, Stefano;Tsukamoto, Shiro;Sanguinetti, Stefano
Ultimo
2021

Abstract

We investigated the nucleation of Ga droplets on singular GaAs(111)A substrates in the view of their use as the seeds for the self-assembled droplet epitaxial quantum dots. A small critical cluster size of 1–2 atoms characterizes the droplet nucleation. Low values of the Hopkins-Skellam index (as low as 0.35) demonstrate a high degree of a spatial order of the droplet ensemble. Around 350∘C the droplet size distribution becomes bimodal. We attribute this observation to the interplay between the local environment and the limitation to the adatom surface diffusion introduced by the Ehrlich–Schwöbel barrier at the terrace edges.
Articolo in rivista - Articolo scientifico
droplet epitaxy, quantum dots, self-assembly
English
25-mar-2021
2021
11
1
6833
open
Tuktamyshev, A., Fedorov, A., Bietti, S., Vichi, S., Tambone, R., Tsukamoto, S., et al. (2021). Nucleation of Ga droplets self-assembly on GaAs(111)A substrates. SCIENTIFIC REPORTS, 11(1) [10.1038/s41598-021-86339-3].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/308998
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