Atomic structure and electronic properties of silicide nanowires

硅化物纳米线的原子结构和电子特性

• 批准号: 221711438
• 负责人: Professor Dr. Mario Dähne
• 金额: --
• 依托单位: Institut für Festkörperphysik
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/221711438?language=en
• 关键词: Atomic; structure; electronic; properties; silicide

This project focuses on the atomic structure and electronic properties of rare earth and transition metal silicide nanowires formed on Si surfaces. The atomic structure is characterized using scanning tunneling microscopy, grazing incidence x-ray diffraction, and low-energy electron diffraction, also with spot-profile analysis and with intensity-voltage analysis. Angle-resolved photoelectron spectroscopy and scanning tunneling spectroscopy are applied for studying the (local) electronic properties. Two strategies for the selforganized nanowire formation are applied, using anisotropic strain of the grown silicides as well as anisotropic substrates. In the first funding period, the work concentrated on rare earth silicide nanowires on the planar and vicinal Si(001) surfaces as well as on corresponding nanostructures on the Si(111) surface. In the second funding period, the focus will shift to rare earth silicide nanowires on anisotropic and vicinal Si surfaces. In addition, alternative material systems such as transition metal nanowires will be studied. For these novel nanowire systems, the growth conditions will be optimized, in particular to obtain sufficiently thin silicide nanowires with corresponding one-dimensional electronic properties. Then the atomic structure and electronic properties will be studied in detail, also for capped nanowires. Moreover, elemental nanowire systems such as Au on Si(111) and Ge(001) will be studied. In addition, optical studies, transport experiments, and theoretical modeling will be performed in cooperating projects in this research group in order to obtain a throughout understanding of the physical properties of the nanowire systems.

该项目重点研究硅表面形成的稀土和过渡金属硅化物纳米线的原子结构和电子特性。使用扫描隧道显微镜、掠入射 X 射线衍射和低能电子衍射以及点轮廓分析和强度电压分析来表征原子结构。角分辨光电子能谱和扫描隧道能谱用于研究（局域）电子特性。应用了两种自组织纳米线形成策略，即使用生长的硅化物的各向异性应变以及各向异性衬底。在第一个资助期间，工作集中在平面和邻位 Si(001) 表面上的稀土硅化物纳米线以及 Si(111) 表面上相应的纳米结构。在第二个资助期，重点将转向各向异性和邻位硅表面上的稀土硅化物纳米线。此外，还将研究过渡金属纳米线等替代材料系统。对于这些新颖的纳米线系统，将优化生长条件，特别是为了获得具有相应一维电子特性的足够薄的硅化物纳米线。然后将详细研究原子结构和电子特性，也适用于带帽纳米线。此外，还将研究元素纳米线系统，例如 Si(111) 和 Ge(001) 上的 Au。此外，该研究组的合作项目还将进行光学研究、传输实验和理论建模，以便全面了解纳米线系统的物理特性。