探针诱导失衡后 Si(111)-(7x7) 上的 Pb 输运
Pb transport on Si(111)-(7x7) following tip induced imbalance
AI总结：
本研究利用扫描力显微镜探针在 Si(111)-(7x7) 上的 Pb 岛制造局部失衡，通过多种显微技术观测到接触后岛体积增加而周围润湿层出现与全局一致的 Pb 密度下降，揭示了润湿层的集体密度减薄现象。
摘要：
Si(111)-(7x7) 上的 Pb 表现出令人惊讶的成核与质量输运动力学，与标准理论相悖。为在稳定的 Pb 岛上产生局部失衡，我们使用扫描力显微镜探针。我们强制探针与岛之间发生短暂的局部接触。随后通过扫描力显微镜和 Kelvin 探针力显微镜研究岛高增长与局部接触电势差。尽管接触后岛体积大幅增加，我们观察到其周围润湿层的 Pb 密度下降幅度与全局润湿层相同。这表明润湿层发生了集体密度减薄。
英文摘要：
Pb on Si(111)-(7x7) shows surprising nucleation and mass transport dynamics at odds with standard theories. To create local imbalances on stable Pb islands we use the tip of a scanning force microscope. We enforce a short, local contact between the island and our tip. The subsequent island height growth and the local contact potential difference are studied via scanning force microscopy and Kelvin probe force microscopy. Though the island has a large volume increase after the contact, we observe that its surrounding wetting layer shows the same Pb density decrease as the global wetting layer. This indicates a collective density thinning of the wetting layer.
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