Institute of Physics, M Curie-Skłodowska University, Place M Curie-Skłodowskiej 1, 20-031 Lublin, Poland.
J Phys Condens Matter. 2012 Mar 7;24(9):095002. doi: 10.1088/0953-8984/24/9/095002. Epub 2012 Jan 25.
Using scanning tunneling microscopy/spectroscopy (STM/STS), angle resolved photoemission spectroscopy (ARPES) and first-principles density functional theory (DFT), we study the structural and the electronic properties of the Si(111)5 × 2-Au surface decorated with Pb adatoms. The STM topography data reveal that Pb adatoms form a similar superstructure to that observed in the case of Si adatoms on a bare Si(111)5 × 2-Au surface. The DFT calculations show that preferential adsorption sites of Pb atoms are located near the double Au chain. Bias dependent STM topography and spectroscopy together with the DFT calculations allow us to distinguish Pb from Si adatoms. Both the Si and Pb adatoms modify the electronic properties in the same way, which confirms the electronic origin of the stabilization of the surface.
利用扫描隧道显微镜/光谱（STM/STS）、角分辨光电子能谱（ARPES）和第一性原理密度泛函理论（DFT），我们研究了 Si(111)5×2-Au 表面上 Pb 原子的结构和电子性质。STM 形貌数据表明，Pb 原子形成了类似于在裸 Si(111)5×2-Au 表面上 Si 原子的超结构。DFT 计算表明，Pb 原子的优先吸附位位于双 Au 链附近。偏压相关的 STM 形貌和光谱以及 DFT 计算使我们能够区分 Pb 和 Si 原子。Si 和 Pb 原子以相同的方式修饰电子性质，这证实了表面稳定的电子起源。
