Electronic Effects in Quantum Structures

量子结构中的电子效应

• 批准号: 0203003
• 负责人: Tai Chiang
• 金额: $ 33万
• 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: 2002
• 资助国家: 美国
• 起止时间: 2002-08-01 至 2006-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0203003&HistoricalAwards=false
• 关键词: Electronic; Effects; Quantum; Structures

Geometric confinement of electrons in quantum structures including films, nano wires, and nano dots leads to quantization and the formation of discrete states or subbands. As a result, electronic properties including the total energy, electronic charge distribution, and density of states can exhibit quantum variations as a function of system size and boundary conditions. The structure and dynamic properties may also be affected due to electron-lattice and electron-phonon coupling. This project aims at a fundamental understanding of these quantum effects and phenomena. 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. Besides the quest for fundamental knowledge, an important mission of this project is the education and training of students and postdoctoral research associates. The rigorous training provided by this project involving national synchrotron radiation facilities, state-of-the-art instruments, and detailed theoretical modeling matches well with the highly technical personnel needs of universities, industry, and national laboratories.Nanoscale features prepared on solid surfaces in the form of thin films, narrow wires, and small dots offer opportunities for creating novel properties. Namely, electrons in the system, confined by the geometry, can exhibit modified electronic structure, and thus the physical properties of the system can be size-dependent and thereby tunable. This project aims at a fundamental understanding of these quantum effects and phenomena. The proposed work will include photoemission measurements of the electronic structure at the Synchrotron Radiation Center in Stoughton, Wisconsin, and x-ray scattering and diffraction studies of the lattice structure at the Advanced Photon Source, Argonne National Laboratory. Besides the quest for fundamental knowledge, an important mission of this project is the education and training of students and postdoctoral research associates. The rigorous training provided by this project involving national synchrotron radiation facilities, state-of-the-art instruments, and detailed theoretical modeling matches well with the highly technical personnel needs of universities, industry, and national laboratories

在包括薄膜、纳米线和纳米点在内的量子结构中，电子的几何限制导致量子化和离散状态或子带的形成。因此，包括总能量、电子电荷分布和态密度在内的电子性质可以表现出量子变化，作为系统大小和边界条件的函数。由于电子-晶格和电子-声子耦合，结构和动力学性质也可能受到影响。本项目旨在对这些量子效应和现象有一个基本的了解。拟议的工作将包括在威斯康星州斯托顿的同步辐射中心进行光电发射，以及在阿贡国家实验室的先进光子源进行x射线散射和衍射。除了对基础知识的探索外，该项目的一个重要任务是教育和培训学生和博士后研究人员。本项目采用国家同步辐射设施、先进仪器和详尽的理论建模，提供严格的培训，与高校、行业和国家实验室对高技术人才的需求相匹配。在固体表面以薄膜、细线和小点的形式制备的纳米级特征为创造新特性提供了机会。也就是说，系统中的电子，受几何结构的限制，可以表现出修改的电子结构，因此系统的物理性质可以是尺寸相关的，从而可调。本项目旨在对这些量子效应和现象有一个基本的了解。拟议的工作将包括在威斯康星州斯托顿的同步辐射中心对电子结构进行光电发射测量，以及在阿贡国家实验室的先进光子源对晶格结构进行x射线散射和衍射研究。除了对基础知识的探索外，该项目的一个重要任务是教育和培训学生和博士后研究人员。本项目采用国家同步辐射设施、先进仪器和详尽的理论建模，提供严格的培训，与高校、行业和国家实验室对高技术人才的需求相匹配