Two-Step Formation of Gallium Droplets with High Controllability of Size and Density

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• 作者：Masafumi Jo ; Takaaki Mano ; Kazuaki Sakoda
• 刊名：Crystal Growth & Design
• 出版年：2011
• 出版时间：October 5, 2011
• 年：2011
• 卷：11
• 期：10
• 页码：4647-4651
• 全文大小：855K
• 年卷期：v.11,no.10(October 5, 2011)
• ISSN：1528-7505

文摘

We demonstrate the two-step formation of Ga droplets, which consists of the first formation at a high temperature followed by the second formation at a low temperature. The first droplets provide the Ga-richest surface, on which the second droplets start to nucleate almost immediately after deposition. This facilitates precise control of the amount of second droplets, leading to the reproducible formation of small Ga droplets with low density. These Ga droplets are crystallized into GaAs quantum dots by irradiating As flux, which allows single-dot spectroscopy without sample fabrication.