Surface-state–mediated three-adsorbate interaction
Surface-state–mediated three-adsorbate interaction
复制标题
表面态介导的三吸附物相互作用
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
T. Einstein
中科院分区：
文献类型：
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作者：
P. Hyldgaard;T. Einstein
表面上的三个吸附物的相互作用能由三对相互作用的总和加上三重贡献所产生的电子传播的整个周长，d123，三个吸附物集群的干扰。在这里，我们研究这种三重吸附相互作用，是由各向同性的肖克莱表面态带贵金属（111）表面上发现的。我们的实验测试结果取决于s波相移，δF <$0，表征扫描隧道显微镜（STM）图像中看到的驻波图案。与吸附物对相互作用和本体介导的相互作用相比，三重贡献的振幅略弱，渐近衰减略快，d123−5/2。它也有一个独特的振荡周期依赖于d123。最后，我们比较的渐近描述与精确的模型计算。
The interaction energy of three adsorbates on a surface consists of the sum of the three pair interactions plus a trio contribution produced by interference of electrons which propagate the entire perimeter, d123, of the three-adsorbate cluster. Here we investigate this triple-adsorbate interaction that is mediated by the isotropic Shockley surface-state band found on noble-metal (111) surfaces. Our experimentally testable result depends on the s-wave phase shift, δF ≠ 0, characterizing the standing-wave patterns seen in scanning-tunneling microscopy (STM) images. Compared with the adsorbate-pair interactions, and in contrast to bulk-mediated interactions, the trio contribution has a slightly weaker amplitude and asymptotically decays slightly faster, d123−5/2. It also has a distinctive oscillation period dependent on d123. We finally compare the asymptotic description with exact model calculations.