Assuming a vacancy-mediated diffusion, a continuum model for electromigration-driven transport of an embedded atom cluster across a surface terrace of a phase-separating ${\mathrm{A}}_x{\mathrm{B}}_{1-x}$ surface alloy, such as fcc AgPt(111), is presented. Computations show that the electron wind carries the cluster over hundreds of lattice spacings and in the set direction, while the cluster grows and its purity improves during the drift. Impacts of the current density, the diffusion anisotropy, the magnitude, and sign of the ratio of the effective charges $q_A/q_B$, and the jump frequencies ratio ${\mathrm{\Gamma }}_A/{\mathrm{\Gamma }}_B$ on the cluster's drift speed, drift direction, purity, and shape are demonstrated.

中文翻译：

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通过二元表面合金的电迁移直接指导近乎纯净的原子团簇的远距离迁移

假设空位介导的扩散，连续模型用于电迁移驱动嵌入的原子团簇穿过相分离的表面平台的传输 ${\mathrm{一个}}_X{\mathrm{乙}}_{\mathrm{1个}-X}$提出了一种表面合金，例如fcc AgPt（111）。计算表明，电子风在设定的方向上沿数百个晶格间距携带团簇，而团簇在漂移过程中生长且其纯度提高。电流密度，扩散各向异性，幅度和有效电荷比率的符号的影响$q_{\mathrm{一个}}/q_{乙}$，以及跳跃频率比率 ${\mathrm{\Gamma }}_{\mathrm{一个}}/{\mathrm{\Gamma }}_{乙}$ 在簇的漂移速度，漂移方向，纯度和形状上进行了演示。