CAREER: Spin Transport and Dynamics in Nanostructures

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。该职业奖支持自旋输运和相关现象的综合研究和教育计划。自旋在物质的涌现阶段以及非平衡现象中发挥着核心作用，后者激发了人们对利用电子自旋进行操作的设备技术的潜在应用的兴趣。本研究主要集中在几个相关的主题，探索自旋输运和动力学的集体和拓扑性质，可以分为两个广泛的领域：（1）磁性材料和纳米结构中的自旋流和序参量动力学。电子自旋在磁性织构中的传播经历了与织构的反应耦合。接下来呢？自旋磁流体力学产生迷人的现象，如自旋力矩和互易电动势规范场，最近点燃了充满活力的理论和实验活动。PI将追求微观和现象学的方法耗散和随机磁电子现象，近和远的平衡，特别强调非线性电流感应动力学和不稳定性。(2)自旋轨道耦合量子输运与关联。 PI将开发自旋输运的几何描述，包括自旋轨道耦合，并将研究低维系统，小环，环阵列和维格纳晶体中的本地化和干涉效应;自旋输运的边缘和界面特性;以及半经典和量子自旋霍尔效应。PI还将更广泛地探索纳米结构中的量子几何和相关效应，重点关注固态介质中的虚拟规范场以及自旋电子，磁性，弹性和光学现象之间的相互作用。PI将与工业界合作解决磁系统中的耗散、随机动力学和电流驱动不稳定性问题，以及新的磁电子器件概念。该奖项的教育部分将建立在加州大学洛杉矶分校加州纳米系统研究所已经成功的推广计划的基础上，该研究所与洛杉矶公立学校合作，在洛杉矶联合学区推广纳米科学和纳米技术的想法和兴奋。将为加州大学洛杉矶分校REU项目开发理论纳米科学部分，为学生提供一个可以研究、模拟和优化磁电子电路的项目，同时还与加州大学洛杉矶分校校园的实验学家和工程师合作。该领域的广泛范围非常适合为物理和工程专业的研究生和高级本科生设计新的纳米科学课程。与工业界的合作将开始在耗散问题，随机动力学，磁系统中的电流驱动的不稳定性，以及新的磁电子器件的概念。非技术性总结该职业奖支持综合理论研究和教育，旨在对材料中电子的固有磁性引起的新现象有更好的基本理解。从某种重要意义上说，电子就像一个带电荷的旋转的小陀螺。电子的自旋与电子紧密相连，电子也像一个微小的磁铁。操纵电子的能力？S自旋使一种新型电子器件成为可能，这种电子器件不仅像传统电子器件那样利用电子电荷，而且利用电子自旋。该奖项支持的研究有助于为这项新技术奠定知识基础。自旋电子学？将通过理论研究来理解和控制自旋如何在材料中移动，并预测由此产生的有趣现象。自旋电子器件可能更节能，并且可能使器件持续成功地快速小型化，伴随着几十年来刺激美国电子工业的增强性能。该奖项的教育部分将建立在加州大学洛杉矶分校加州纳米系统研究所已经成功的推广计划的基础上，该研究所与洛杉矶公立学校合作，在洛杉矶联合学区推广纳米科学和纳米技术的想法和兴奋。将为加州大学洛杉矶分校REU项目开发理论纳米科学部分，为学生提供一个可以研究、模拟和优化磁电子电路的项目，同时还与加州大学洛杉矶分校校园的实验学家和工程师合作。该领域的广泛范围非常适合为物理和工程专业的研究生和高级本科生设计新的纳米科学课程。与工业界的合作将开始在耗散问题，随机动力学，磁系统中的电流驱动的不稳定性，以及新的磁电子器件的概念。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5). TECHNICAL SUMMARYThis CAREER award supports an integrated research and education program on spin transport and related phenomena. Spins play a central role in emergent phases of matter as well as in nonequilibrium phenomena, the latter fueling interest in potential applications to device technologies that exploit the spin of the electron for their operation. The research focuses on several related topics exploring collective and topological properties of spin transport and dynamics, which can be separated into two broad areas: (1) Spin flows and order-parameter dynamics in magnetic materials and nanostructures. Electron spin propagating through a magnetic texture experiences a reactive coupling with the texture. The ensuing ?spin magnetohydrodynamics? produces fascinating phenomena, such as spin torque and reciprocal electromotive gauge fields, which have recently ignited vibrant theoretical as well as experimental activities. The PI will pursue microscopic and phenomenological approaches to dissipative and stochastic magnetoelectronic phenomena, near and far from equilibrium, with particular emphasis on nonlinear current-induced dynamics and instabilities. (2) Spin orbit coupled quantum transport and correlations. The PI will develop a geometric description of spin-transport that includes spin-orbit coupling and will study localization and interference effects in low-dimensional systems, small rings, ring arrays, and Wigner crystals; edge and interfacial properties of spin transport; and semiclassical and quantum spin Hall effects. The PI will also explore more broadly quantum geometric and correlation effects in nanostructures, with a focus on fictitious gauge fields in solid-state media and the interplay between spintronic, magnetic, elastic, and optical phenomena. The PI will collaborate with industry on problems of dissipation, stochastic dynamics, and current-driven instabilities in magnetic systems, as well as new magnetoelectronic device concepts.The education component of this award will build on the already successful outreach program run by the California NanoSystems Institute at the UCLA, which works with Los Angeles public schools, promoting the ideas and excitement of nanoscience and nanotechnology in the Los Angeles unified school district. A theoretical nanoscience component will be developed for the UCLA REU program, offering students a program where they can study, simulate, and optimize magnetoelectronic circuits, while also collaborating with experimentalists and engineers on the UCLA campus. The broad scope of this field is very well suited for designing a new nanoscience course for graduate and advanced undergraduate students in physics and engineering. Collaborations with industry will be initiated on problems of dissipation, stochastic dynamics, and current-driven instabilities in magnetic systems, as well as new magnetoelectronic device concepts. NONTECHNICAL SUMMARYThis CAREER award supports integrated theoretical research and education with an aim to develop a better fundamental understanding of new phenomena that arise because of the intrinsic magnetic properties of an electron in a material. In an important sense an electron is like a tiny spinning top with an electric charge. The spin of the electron is intimately connected to the electron being also like a tiny magnet. The ability to manipulate the electron?s spin enables a new kind of electronic device that utilizes not only the electron charge, like conventional electronic devices, but also its spin. The research supported by this award contributes to the intellectual foundation upon which this new technology called ?spintronics? will rest through theoretical research to understand and control how spin moves through materials and to predict interesting phenomena that arise as a consequence. Spintronic devices may be more energy efficient and may enable continued successful rapid miniaturization of devices accompanied by enhanced performance that has stimulated the American electronics industry for decades.The education component of this award will build on the already successful outreach program run by the California NanoSystems Institute at the UCLA, which works with Los Angeles public schools, promoting the ideas and excitement of nanoscience and nanotechnology in the Los Angeles unified school district. A theoretical nanoscience component will be developed for the UCLA REU program, offering students a program where they can study, simulate, and optimize magnetoelectronic circuits, while also collaborating with experimentalists and engineers on the UCLA campus. The broad scope of this field is very well suited for designing a new nanoscience course for graduate and advanced undergraduate students in physics and engineering. Collaborations with industry will be initiated on problems of dissipation, stochastic dynamics, and current-driven instabilities in magnetic systems, as well as new magnetoelectronic device concepts.