Au（111）表面合金化制备二维稀土-金金属间化合物
Two-Dimensional Rare Earth -- Gold Intermetallic Compounds on Au(111) by Surface Alloying
摘要：
表面合金化是控制和改变表面结构和电子性质的直接途径。本文系统地研究了三种新型稀土金属间化合物ReAu_2（Re = Tb，Ho，Er）在Au（111）表面的结构和电子性质。扫描隧道显微镜/光谱测量揭示了非常相似的原子结构和电子性质，例如电子状态，和表面功函数，所有这些金属间化合物系统由于这些稀土元素之间的物理和化学相似性。此外，这些电子性质被ReAu 2和Au（111）之间的晶格失配引起的莫尔结构周期性地调制。这些周期性调制的表面可以作为纳米结构自组装的模板。此外，这些二维稀土基金属间化合物为研究稀土相关的催化、磁性等提供了平台，在较低的维度。
英文摘要：
Surface alloying is a straightforward route to control and modify the structure and electronic properties of surfaces. Here, We present a systematical study on the structural and electronic properties of three novel rare earth-based intermetallic compounds, namely ReAu2 (Re = Tb, Ho, and Er), on Au(111) via directly depositing rare-earth metals onto the hot Au(111) surface. Scanning tunneling microscopy/spectroscopy measurements reveal the very similar atomic structures and electronic properties, e.g. electronic states, and surface work functions, for all these intermetallic compound systems due to the physical and chemical similarities between these rare earth elements. Further, these electronic properties are periodically modulated by the moiré structures caused by the lattice mismatches between ReAu2 and Au(111). These periodically modulated surfaces could serve as templates for the self-assembly of nanostructures. Besides, these two-dimensional rare earth-based intermetallic compounds provide platforms to investigate the rare earth related catalysis, magnetisms, etc., in the lower dimensions.
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