Electron-Phonon Interaction and Disorder: Nanoscale Interference in Transport Phenomena

该奖项是根据2009年美国复苏和再投资法案（公法111-5）资助的。该奖项支持理论研究和教育，重点关注低维导体、纳米材料和强相关材料（如掺杂莫特电介质）中的电子-声子动力学和电、热、热磁输运，例如新型超导体和导电聚合物。振动边界、缺陷或掺杂物产生另一个电子-声子相互作用通道，这干扰了通常的电子-声子和弹性电子散射。散射机制的干扰极大地改变了动力学和输运现象。干扰效应很强，很容易观察到。虽然人们已经知道干扰的影响有一段时间了，但在这一领域的研究是有限的。pi将研究低维结构（如异质结构、超薄膜、多壁碳纳米管、纳米线、金属团簇和量子点阵列）中的电子-声子动力学和电、热、热磁输运。在低维中，由于较小的电子动量转移和与集体激发相关的动量转移的固有特性，预计干涉效应会有很强的增强。pi将研究特定材料中的电子-声子干涉效应，如石墨烯和各种掺杂莫特电介质。该研究旨在促进对动力学和输运中散射机制的量子干涉的关键见解的发展，并将有助于显著改进与量子输运方程和费曼-凯德什图技术相关的理论技术。这项研究计划有助于开发有效的方法来管理电子-声子传输和能量转移，这将反过来强烈影响先进纳米器件和材料的发展。许多令人困惑的实验结果将在本程序开发的框架中找到解释。该项目将通过其对教育的贡献，以及通过开发可以对材料科学和工程产生影响的理论模型，产生更广泛的影响。纳米级热管理将实质性地影响电子工业的几乎所有分支。这项研究将对纳米器件的发展产生直接影响，在纳米器件中，能量转移是“量身定制的”。具体应用，如超灵敏纳米热计和单量子纳米探测器在低温和中温下工作。与研究生和本科生一起，pi将为小学和高中学生开发一套专门的实验。这些演示与现代电子学和纳米技术直接相关。资讯科技平台将透过Java小应用程式整合资讯科技；他们正在扩展这些小程序，以纳入纳米世界的能量转移。他们还在为布法罗科学博物馆的物理世界科学工作室开发一个互动式展览，这将有助于向更广泛的公众推广纳米技术。将以适合一般公众的水平开展讲座和示范。该奖项支持理论研究，旨在阐明控制热和电如何通过比人类头发直径小数千倍的材料、结构和设备的微观机制。pi将发展一种理论，研究电子水平和原子尺度的表面和缺陷，以及它们流过这些微小结构时遇到的振动。该项目将为未来半导体器件的电路特征尺寸在小长度尺度上的散热管理提供知识基础。高速电子设备产生的热量是阻碍电子设备向更小方向发展的障碍之一。年代法律。这项研究也将有助于小尺度探测器技术的知识基础。与研究生和本科生一起，pi将为小学和高中学生开发一套专门的实验。这些演示与现代电子学和纳米技术直接相关。资讯科技平台将透过Java小应用程式整合资讯科技；他们正在扩展这些小程序，以纳入纳米世界的能量转移。他们还在为布法罗科学博物馆的物理世界科学工作室开发一个互动式展览，这将有助于向更广泛的公众推广纳米技术。将以适合一般公众的水平开展讲座和示范。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).TECHNICAL SUMMARYThis award supports theoretical research and education focused on electron-phonon kinetics and electric, thermal, and thermomagnetic transport in low-dimensional conductors, nanomaterials, and strongly correlated materials such as doped Mott dielectrics, e.g. novel superconductors and conducting polymers. Vibrating boundaries, defects, or dopants generates another channel of electron-phonon interaction, which interferes with the usual electron-phonon and elastic electron scattering. The interference of scattering mechanisms drastically modifies kinetic and transport phenomena. The interference effects can be strong and easily observable. While effects of interference have been known for some time, the research in this field is limited. The PIs will investigate electron-phonon kinetics and electric, thermal, and themomagnetic transport in low-dimensional structures, such as heterostructures, ultrathin films, multi-walled carbon nanotubes, nanowires, metallic clusters, and quantum dot arrays. In low dimensions, strong enhancement of interference effects is expected due to a smaller electron momentum transfer and due to intrinsic peculiarities in the momentum transfer related to the collective excitations. The PIs will investigate electron-phonon interference effects in specific materials, such as graphene and various doped Mott dielectrics.The research is aimed to contribute to the development of critical insights into the quantum interference of scattering mechanisms in kinetics and transport and will contribute to significantly improved theoretical techniques, related to the quantum transport equation and Feynman-Keldysh diagrammatic techniques. This research program contributes to developing effective ways to manage electron-phonon transport and energy transfer which will, in turn, strongly impact the development of advanced nanodevices and materials. A number of puzzling experimental results will find their explanation in the framework developed by this program.The project will have broader impacts through its contributions to education, and by developing theoretical models that can have impact in materials science and engineering. Nanoscale thermal management will substantially affect practically all branches of the electronics industry. This research will have immediate impact on the development of nanodevices in which energy transfer is ?tailored? to specific applications, e.g. ultrasensitive nanocalorimeters and single quanta nanodetectors operating at low and moderate temperatures. With graduate and undergraduate students, the PIs will develop a set of specialized experiments for elementary and high school students. These demonstrations are directly related to modern electronics and nanotechnology. The PIs will incorporate information technologies via Java Applets; they are extending these applets to incorporate the nanoworld energy transfer. They are also developing an interactive exhibit for the Physical World Science Studio of the Buffalo Museum of Science that will help to promote nanotechnology to a broader public. Lectures and demonstrations will be developed at a level appropriate for the general public.NON-TECHNICAL SUMMARYThis award supports theoretical research aimed to elucidate the microscopic mechanisms that control how heat and electricity flow through materials structures and devices that are thousands of times smaller than the diameter of a human hair. The PIs will develop a theory on the level of electrons and the atomic-scale surfaces and defects, and vibrations that they encounter as they flow through these tiny structures. This project will contribute to the intellectual foundations for managing heat dissipation at small length scales anticipated for future circuit feature sizes of semiconductor devices. The heat generated by high speed electronic devices looms as one of the barriers to the continuing trend toward ever smaller electronic devices known as Moore?s law. This research will also contribute to the intellectual foundations of detector technologies on small length scales.With graduate and undergraduate students, the PIs will develop a set of specialized experiments for elementary and high school students. These demonstrations are directly related to modern electronics and nanotechnology. The PIs will incorporate information technologies via Java Applets; they are extending these applets to incorporate the nanoworld energy transfer. They are also developing an interactive exhibit for the Physical World Science Studio of the Buffalo Museum of Science that will help to promote nanotechnology to a broader public. Lectures and demonstrations will be developed at a level appropriate for the general public.