Metal adsorption upon the 3-fold and 5-fold symmetric surfaces of the i-Ag-In-Yb quasicrystal has led to the observation of unique growth modes. Here, we present a study of the growth of Pb upon the 2-fold i-Ag-In-Yb surface, where the growth mechanism is found to be different from those observed on the other, higher symmetry surfaces of the same system. Initial Pb atoms occupy non-chemically-specific surface sites before forming a row structure. At higher coverages, the Pb atoms form a dense wetting layer before 1D Pb chains of limited size are self-assembled as a second layer. We therefore consider the Pb atoms to exhibit a type of Stranski-Krastanov growth mode. Substrate-adsorbate interaction is favoured in the wetting layer, before adsorbate-adsorbate interaction promotes chain growth. The difference in growth modes upon the three high symmetry surfaces is discussed with respect to their respective atomic densities.

中文翻译：

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取向面密度差异对i-Ag-In-Yb准晶上Pb生长的影响


i-Ag-In-Yb 准晶的 3 重和 5 重对称表面上的金属吸附导致观察到独特的生长模式。在这里，我们研究了 Pb 在 2 倍 i-Ag-In-Yb 表面上的生长，发现其生长机制与在同一系统的其他更高对称性表面上观察到的生长机制不同。初始 Pb 原子在形成行结构之前占据非化学特异性表面位点。在较高的覆盖率下，Pb 原子在有限尺寸的一维 Pb 链自组装为第二层之前形成致密的润湿层。因此，我们认为 Pb 原子表现出一种 Stranski-Krastanov 生长模式。在吸附物-吸附物相互作用促进链增长之前，润湿层有利于底物-吸附物相互作用。讨论了三个高对称性表面上生长模式的差异及其各自的原子密度。