Expanding the Capabilities of Photoelectron Spectroscopy as to Reveal the Coupling of Different Degrees of Freedom in Complex Electron Systems

扩展光电子能谱的能力以揭示复杂电子系统中不同自由度的耦合

• 批准号: 0804902
• 负责人: Norman Mannella
• 金额: $ 30万
• 依托单位: University of Tennessee Knoxville
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2008
• 资助国家: 美国
• 起止时间: 2008-09-15 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0804902&HistoricalAwards=false
• 关键词: Expanding; Capabilities; Photoelectron; Spectroscopy; Reveal

Non-technical AbstractComplex electron systems with unusual properties, such as magnetism and superconductivity or large resistivity in a magnetic field, promise revolutionary technological applications. A unifying characteristic of these systems is the capability of exhibiting spectacular and unexpected phenomena arising from the interplay and competition of several intrinsic properties such as charge, crystal structure and magnetism. Unraveling the details of this interplay will help us understand the physics behind the functionality of complex materials. This project pursues the objectives of growing novel oxide materials and studying them in-situ with optical and x-ray techniques. Studies of previously characterized systems will also be made for comparison. The different tasks and project activities are designed with the goals to reach out to undergraduate and high school students, contribute to science infrastructure and integrate science and education. Educational/research programs will be available to allow the participation of students ranging from high school to graduate level. Intellectual infrastructure of this project is expected to aid in the development of new magnetic and superconducting devices.Technical AbstractTransition metal oxides such as cuprate high temperature superconductors and colossal magnetoresistive manganites are prototypical complex electron systems with unusual properties promising revolutionary technological applications. A unifying characteristic of these systems is the capability of exhibiting spectacular and unexpected phenomena arising from the interplay and competition of several intrinsic properties such as charge, lattice and spin. Unraveling the details of this interplay will consolidate our understanding of the physics at play behind the functionality of complex materials. This project pursues two main objectives, namely the carrying out of 1) the growth with Molecular Beam Epitaxy and in-situ Angle Resolved Photoemission studies of binary oxides, Fe3O4, VOx, EuO and V2O3, which will function as models systems for studying the many-body physics at play in more complex materials, and 2) time-resolved photoemission experiments on well-characterized systems, either with ultrafast optical techniques and/or x-rays, or whose nature of the interactions has already been extensively investigated with static measurements. The accomplishment of these goals on well-characterized systems will form a solid body of experience for extending the project to more complex materials. The different tasks and project activities are designed with the goals to reach out to undergraduate and high school students, contribute to science infrastructure and integrate science and education. Educational/research programs will be available to allow the participation of students ranging from high school to graduate level. Intellectual infrastructure of this project is expected to aid in the development of new magnetic and superconducting devices.

具有不寻常性质的复杂电子系统，如磁性和超导性或磁场中的大电阻率，有望实现革命性的技术应用。这些系统的一个统一特征是能够表现出壮观的和意想不到的现象，这些现象是由电荷、晶体结构和磁性等几种内在性质的相互作用和竞争引起的。解开这种相互作用的细节将有助于我们理解复杂材料功能背后的物理学。该项目追求的目标是生长新型氧化物材料，并利用光学和X射线技术原位研究它们。以前的特点系统的研究也将进行比较。不同的任务和项目活动的目的是接触本科生和高中生，促进科学基础设施和整合科学和教育。将提供教育/研究方案，以允许从高中到研究生水平的学生参与。 该项目的知识基础设施预计将有助于开发新的磁性和超导器件。技术摘要过渡金属氧化物，如铜酸盐高温超导体和巨大的磁阻锰氧化物是典型的复杂电子系统与不寻常的性能，有希望的革命性技术应用。这些系统的一个统一的特点是能够表现出壮观的和意想不到的现象所产生的相互作用和竞争的几个内在的属性，如电荷，晶格和自旋。解开这种相互作用的细节将巩固我们对复杂材料功能背后的物理学的理解。该项目有两个主要目标，即：1）对二元氧化物Fe 3 O 4、VOx、EuO和V2 O3进行分子束外延生长和原位角分辨光电子发射研究，这些氧化物将作为模型系统，用于研究在更复杂材料中发挥作用的多体物理学; 2）对表征良好的系统进行时间分辨光电子发射实验，或者使用超快光学技术和/或X射线，或者其相互作用的性质已经用静态测量进行了广泛的研究。这些目标的实现对良好的表征系统将形成一个坚实的经验，该项目扩展到更复杂的材料。不同的任务和项目活动的目的是接触本科生和高中生，促进科学基础设施和整合科学和教育。将提供教育/研究方案，以允许从高中到研究生水平的学生参与。 该项目的智能基础设施预计将有助于开发新的磁性和超导设备。