Electronic Effects in Quantum Structures

电子在包括薄膜、纳米线和纳米点在内的量子结构中的几何限制导致量子化和分立态或亚带的形成。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随着系统大小和边界条件的变化而呈现量子变化。电子-晶格和电子-声子耦合也会影响其结构和动力学性质。这个项目旨在从根本上理解这些量子效应和现象。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子发射，以及阿贡国家实验室高级光子源的X射线散射和衍射。除了对基础知识的探索外，该项目的一个重要使命是教育和培训学生和博士后研究助理。该项目提供的严格培训涉及国家同步辐射设施、最先进的仪器和详细的理论建模，与大学、工业和国家实验室的高技术人才需求非常匹配。在固体表面上制备的薄膜、细线和小网点形式的纳米特征为创造新特性提供了机会。也就是说，受几何结构的限制，系统中的电子可以表现出修改的电子结构，因此系统的物理性质可以是大小相关的，从而是可调的。这个项目旨在从根本上理解这些量子效应和现象。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的光电子发射测量，以及在阿贡国家实验室高级光子源对晶格结构的X射线散射和衍射研究。除了对基础知识的探索外，该项目的一个重要使命是教育和培训学生和博士后研究助理。该项目提供的严格培训涉及国家同步辐射设施、最先进的仪器和详细的理论建模，与大学、工业和国家实验室的高技术人员需求非常匹配。

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