Anomalous scaling in heteroepitaxial island dynamics on Ag(100).
Anomalous scaling in heteroepitaxial island dynamics on Ag(100).
复制标题
Ag(100) 上异质外延岛动力学的异常缩放。
DOI：
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发表时间：
2011
影响因子：
8.6
通讯作者：
K. Morgenstern
中科院分区：
文献类型：
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作者：
C. Zaum;M. Rieger;K. Reuter;K. Morgenstern
利用快扫描隧道显微镜和密度泛函理论研究了室温下Ag（100）表面Cu/Ag合金岛在1 ~ 40 nm ~ 2范围内的扩散和衰减.虽然大小超过7 nm 2的岛显示出基于单原子跳跃的动力学所预期的扩散和衰变行为，但小于4 nm 2的岛的扩散速度更快，衰变速度比标准理论预测的要慢。这种异常行为在意想不到的大岛屿的大小是与大小相关的Cu/Ag岛的脱合金。
Diffusion and decay of alloyed Cu/Ag islands are investigated in the size range from 1 to 40 nm2 on Ag(100) at room temperature with fast-scanning tunneling microscopy and density functional theory. While islands at sizes above 7 nm2 show the diffusion and decay behavior expected for dynamics based on single atom hopping, islands smaller than 4 nm2 diffuse faster and decay slower than predicted by standard theory. This anomalous behavior at unexpected large island sizes is related to a size dependent dealloying of the Cu/Ag islands.