标题： 单原子有序阵列及其显著的热稳定性：Au/Fe3O4(001) 显示英文标题

标题： Ordered Array of Single Adatoms with Remarkable Thermal Stability: Au/Fe3O4(001)

摘要： 在室温下沉积在Fe$_3$O$_4$(001)表面的金通过扫描隧道显微镜（STM）和X射线光电子能谱（XPS）进行了研究。 该表面形成一种($\sqrt2 \times \sqrt2$)R45$^{\circ}$重构，其中Fe离子和相邻的O离子对会略微横向位移，产生具有“狭窄”和“宽广”空位的波动条纹。 在低覆盖率下，单个金原子仅吸附在狭窄位点，直到退火温度达到400$^{\circ}$C时没有明显的烧结。我们提出这种强位点偏好与铁$_3$O$_4$(001)-($\sqrt2 \times \sqrt2$)R45$^{\circ}$的第一亚表层内的电荷和轨道有序有关。由于其高热稳定性，这可能证明是一个理想的模型系统，用于探测单一原子物种的化学反应性。 显示英文摘要

摘要： Gold deposited on the Fe$_3$O$_4$(001) surface at room temperature was studied using Scanning Tunneling Microscopy (STM) and X-ray photoelectron spectroscopy (XPS). This surface forms a ($\sqrt2 \times \sqrt2$)R45$^{\circ}$ reconstruction, where pairs of Fe and neighboring O ions are slightly displaced laterally producing undulating rows with `narrow' and `wide' hollow sites. At low coverages, single Au adatoms adsorb exclusively at the narrow sites, with no significant sintering up to annealing temperatures of 400 $^{\circ}$C. We propose the strong site preference to be related to charge and orbital ordering within the first subsurface layer of Fe$_3$O$_4$(001)-($\sqrt2 \times \sqrt2$)R45$^{\circ}$. Due to its high thermal stability, this could prove an ideal model system for probing the chemical reactivity of single atomic species.