Metallic and Magnetic Quantum Structures

金属和磁性量子结构

• 批准号: 9531809
• 负责人: Tai Chiang
• 金额: $ 27万
• 依托单位: University of Illinois at Urbana-Champaign
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-01 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9531809&HistoricalAwards=false
• 关键词: Metallic; Magnetic; Quantum; Structures

w:\awards\awards96\*.doc 9531809 Chiang The structure, growth behaviors, and properties of selected metal surfaces, interfaces, quantum wells, and superlattices are being investigated. The purpose is to obtain a fundamental understanding of the scientific principles that govern the crystalline form, chemical composition, and electronic properties of metal epitaxial systems and quantum structures. The experimental techniques include angle-resolved synchrotron photoemission, Auger spectroscopy, electron diffraction, and scanning tunneling microscopy. The work will include investigations of (1) the bulk and surface band structure, coherence and scattering lengths, and spatial distributions of electronic states, (2) the physics and chemistry of film growth, (3) the structure-property relationships for various quantum configurations, (4) Kondo effects in two dimensional surface alloys, and (5) spin effects in systems containing magnetic materials. %%% Artificial structures made of stacks of thin layers can exhibit interesting and potentially useful electronic properties. Using state-of-the-art techniques of materials synthesis, it is now possible to fabricate layer configurations with atomic layer precision. Electrons in such systems can become trapped, reflected, or refracted by the boundaries between layers, resulting in new properties, which offer opportunities for various electronic applications. This research project will employ a variety of experimental techniques to investigate the basic physics and chemistry of atomic layer formation, and to determine the relationships between the atomic structure and the electronic properties. Part of the work will be carried out at the Synchrotron Radiation Center, a national facility funded by the National Science Foundation. ***

9531809江：正在研究选定的金属表面、界面、量子井和超晶格的结构、生长行为和性质。其目的是对支配金属外延系统和量子结构的晶体形式、化学成分和电子性质的科学原理有一个基本的了解。实验技术包括角分辨同步光电子能谱、俄歇能谱、电子衍射和扫描隧道显微镜。这项工作将包括研究(1)体和表面能带结构，相干和散射长度，以及电子态的空间分布，(2)薄膜生长的物理和化学，(3)各种量子组态的结构-性质关系，(4)二维表面合金中的近藤效应，以及(5)含有磁性材料的系统中的自旋效应。由薄层堆叠而成的人工结构可以显示出有趣的和潜在有用的电子性质。使用最先进的材料合成技术，现在可以制造具有原子层精度的层配置。这样的系统中的电子可以被层之间的边界捕获、反射或折射，从而产生新的性质，这为各种电子应用提供了机会。该研究项目将利用各种实验技术来研究原子层形成的基本物理和化学，并确定原子结构和电子性质之间的关系。部分工作将在同步辐射中心进行，这是一个由国家科学基金会资助的国家设施。***