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采用原子尺度的模拟方法,探讨了在零偏压下扫描隧道显微镜(STM)针尖调制的金属表面岛上原子运动及岛边的层间质量输运.研究结果显示STM的移动对岛上及岛边的原子扩散有重要的影响.针尖与吸附原子的交互作用及岛和基体中强的形状变化影响了岛上吸附原子的跳跃扩散及岛边的跳下扩散和交换扩散过程.研究发现,通过调节针尖与基体的垂直距离及针尖与吸附原子的水平距离,可以降低岛上吸附原子的跳跃扩散能垒及岛边的跳下扩散和交换扩散能垒,从而实现薄膜由三维生长模式向二维生长模式的转变.
Atomic scale simulation method was used to investigate the atomic motion on island metal surface and the interlayer transport between the islands under the scan of the tunneling microscope (STM) at zero bias. The results show that the movement of STM on the island and island The interaction of the tip with the adsorbed atoms and the strong shape changes in the island and the matrix affect the jumping diffusion of the adsorbed atoms and the jumped-down diffusion and exchange-diffusion process of the islands. It is found that by means of Adjusting the vertical distance between the needle tip and the substrate and the horizontal distance between the needle tip and the adsorbed atom can reduce the jumping diffusion barrier of the adsorbed atoms on the island and the jumping diffusion and the exchange diffusion barrier of the island so that the three- Change of growth pattern.