Pd/Ru（0001）异质外延过程中的岛状生长
Labyrinthine Island Growth during Pd/Ru(0001) Heteroepitaxy
摘要：
使用低能量电子显微镜，我们观察到，Pd沉积在Ru上只连接到周围的Pd岛的原子台阶边缘的小部分。这导致了一种新的外延生长模式，其中岛屿以蛇形运动前进，从而产生了螺旋形图案。基于密度泛函理论，结合扫描隧道显微镜和低能电子显微镜，我们认为这种生长模式是由生长岛周围形成的表面合金引起的。这种合金逐渐降低台阶附着率，导致不稳定性，有利于吸附原子附着在快速前进的台阶部分。
英文摘要：
Using low energy electron microscopy we observe that Pd deposited on Ru only attaches to small sections of the atomic step edges surrounding Pd islands. This causes a novel epitaxial growth mode in which islands advance in a snakelike motion, giving rise to labyrinthine patterns. Based on density functional theory together with scanning tunneling microscopy and low energy electron microscopy we propose that this growth mode is caused by a surface alloy forming around growing islands. This alloy gradually reduces step attachment rates, resulting in an instability that favors adatom attachment at fast advancing step sections.
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