Electronic and Atomistic Effects in Quantum Structures

量子结构中的电子和原子效应

• 批准号: 0503323
• 负责人: Tai Chiang
• 金额: --
• 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: 2005
• 资助国家: 美国
• 起止时间: 2005-08-01 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0503323&HistoricalAwards=false
• 关键词: Electronic; Atomistic; Effects; Quantum; Structures

Surfaces, thin films, and self-organized surface structures can exhibit interesting and useful properties markedly different from their bulk counterparts due to geometric confinement of electrons and boundary effects. The underlying quantum physics is a cornerstone for nanoscale science and technology which is a broadly based interdisciplinary enterprise highly relevant to the advancement of materials, devices, and technologies. Thin films, in particular, are of fundamental interest, as they are widely employed in devices and coatings. They also provide a research path bridging surfaces and bulk materials. This project aims at a systematic study of the electronic structure of thin films and the connection to physical properties including lattice structure, strain, thermal stability, work function, surface energy, adsorption, electron-phonon coupling, and superconductivity. Emphases will be placed on highly perfect, atomically uniform films that can now be routinely prepared. The proposed work will include photoemission at the Synchrotron Radiation Center in Stoughton, Wisconsin, and x-ray scattering and diffraction at the Advanced Photon Source, Argonne National Laboratory. Integrated with the research effort is education and training of students and postdoctoral associates, as well as outreach to the broader community through publications, lectures, facilities tours, and collaborative projects.%%%%Ultra thin films can exhibit interesting and useful properties markedly different from their bulk counterparts due to geometric confinement of electrons and boundary effects. The underlying quantum physics is a cornerstone for nanoscale science and technology which is a broadly based interdisciplinary enterprise that is of national importance and where there is intense international competition. Thin films are widely employed in devices and coatings, and perfection of thin film properties is a critical issue in the worldwide quest for advancement of materials, devices, and technologies. This project aims at a fundamental understanding, atom-by-atom and layer-by-layer, of the electronic structure of thin films and the connection to physical properties including electrical characteristics, lattice strain, stability, and superconductivity. Emphases will be placed on highly perfect, atomically uniform films that can now be routinely prepared. The proposed work will include spectroscopy measurements at the Synchrotron Radiation Center in Stoughton, Wisconsin, and x-ray measurements at the Advanced Photon Source, Argonne National Laboratory. Integrated with the research effort is education and training of students and postdoctoral associates, as well as outreach to the broader community through publications, lectures, facilities tours, and collaborative projects.

由于电子的几何限制和边界效应，表面、薄膜和自组织表面结构可以表现出有趣且有用的特性，与它们的块状对应物明显不同。基础量子物理学是纳米科学技术的基石，纳米科学技术是一个基础广泛的跨学科事业，与材料、设备和技术的进步高度相关。薄膜尤其受到人们的根本关注，因为它们广泛应用于设备和涂层中。它们还提供了连接表面和散装材料的研究路径。该项目旨在系统研究薄膜的电子结构以及与物理性质的联系，包括晶格结构、应变、热稳定性、功函数、表面能、吸附、电子声子耦合和超导性。重点将放在现在可以常规制备的高度完美、原子均匀的薄膜上。拟议的工作将包括威斯康星州斯托顿同步辐射中心的光电发射，以及阿贡国家实验室先进光子源的 X 射线散射和衍射。与研究工作相结合的是对学生和博士后同事的教育和培训，以及通过出版物、讲座、设施参观和合作项目向更广泛的社区进行推广。%%%%由于电子的几何限制和边界效应，超薄膜可以表现出与块状薄膜明显不同的有趣和有用的特性。基础量子物理学是纳米科学技术的基石，纳米科学技术是一项基础广泛的跨学科事业，具有国家重要性，并且存在激烈的国际竞争。薄膜广泛应用于器件和涂层中，薄膜性能的完善是全球范围内追求材料、器件和技术进步的关键问题。该项目旨在逐个原子、逐层地基本了解薄膜的电子结构以及与物理特性（包括电特性、晶格应变、稳定性和超导性）的联系。重点将放在现在可以常规制备的高度完美、原子均匀的薄膜上。拟议的工作将包括在威斯康星州斯托顿同步辐射中心进行光谱测量，以及在阿贡国家实验室先进光子源进行 X 射线测量。与研究工作相结合的是对学生和博士后同事的教育和培训，以及通过出版物、讲座、设施参观和合作项目向更广泛的社区进行推广。