Ga液滴在GaAs(111)A衬底上的自组装成核。
Nucleation of Ga droplets self-assembly on GaAs(111)A substrates.
作者信息
Tuktamyshev Artur, Fedorov Alexey, Bietti Sergio, Vichi Stefano, Tambone Riccardo, Tsukamoto Shiro, Sanguinetti Stefano
机构信息
Department of Material Science, University of Milano-Bicocca, via R. Cozzi 55, 20125, Milan, Italy.
Laboratory for Nanostructure Epitaxy and Spintronics on Silicon, Polo di Como, via F. Anzani 42, 22100, Como, Italy.
出版信息
Sci Rep. 2021 Mar 25;11(1):6833. doi: 10.1038/s41598-021-86339-3.
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 [Formula: see text] 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.
考虑到将Ga液滴用作自组装液滴外延量子点的种子，我们研究了其在奇异GaAs(111)A衬底上的成核过程。液滴成核的特征是临界团簇尺寸小，仅为1 - 2个原子。霍普金斯 - 斯凯拉姆指数的值很低（低至0.35），表明液滴集合体具有高度的空间有序性。在[公式：见原文]附近，液滴尺寸分布变为双峰。我们将这一观察结果归因于局部环境与台面边缘的埃利希 - 施沃贝尔势垒所引入的吸附原子表面扩散限制之间的相互作用。
Zotero 插件