School of Physics, Monash University, Victoria 3800, Australia.
Phys Rev Lett. 2013 Jul 19;111(3):036102. doi: 10.1103/PhysRevLett.111.036102. Epub 2013 Jul 17.
Droplet epitaxy of GaAs is studied in real time using in situ surface electron microscopy. The resulting movies motivate a theoretical model for quantum ring formation which can explain the origin of nanoscale features such as double rings observed under a variety of experimental conditions. Inner rings correspond to GaAs deposition at the droplet edge, while outer rings result from the reaction of Ga and As atoms diffusing along the surface. The observed variety of morphologies primarily reflects relative changes in the outer rings with temperature and As flux.
使用原位表面电子显微镜实时研究 GaAs 的液滴外延。所得的电影激发了一个量子环形成的理论模型，该模型可以解释纳米级特征的起源，例如在各种实验条件下观察到的双环。内环对应于液滴边缘处的 GaAs 沉积，而外环则是由于 Ga 和 As 原子沿表面扩散的反应产生的。所观察到的各种形态主要反映了外环比温度和 As 通量的相对变化。
