Carrier and Spin Dynamics in Large Spin-Orbit Semiconductor Nanowire Heterostructures

非技术摘要：这个项目是研究人工生长的纳米结构的性质，这些结构具有非常强的自旋相互作用。人们对使用这种材料作为在计算机中使用自旋态的量子性质的基础非常感兴趣，因为这些材料允许使用外加磁场或电场来控制和操纵自旋。该项目的研究小组使用中红外超快激光脉冲来测量单根纳米线中这些电子态的动力学，以了解哪些基本相互作用决定了它们的行为。有了这些信息，该小组可以针对特定的性质优化物理纳米结构，这既可以用于基础物理，也可以用于新技术。该项目涉及对本科生和研究生进行最先进的纳米结构制造和测量技术的培训，这被认为是美国未来经济增长的关键需求。技术摘要：该项目旨在研究具有大的自旋-轨道相互作用的半导体纳米线异质结构的性质，这种异质结构通常也是具有小带隙的材料。这些材料被认为是发展自旋电子器件的重要候选材料，因为自旋态可以通过外加磁场和电场来控制和操纵。该研究小组使用泵浦探测测量单根纳米线在中红外波段的瑞利散射效率，以探测在外加电场和磁场中的电子态及其动力学。这项研究的基本目标是了解纳米结构中的哪些基本相互作用控制它们的动力学，以便找到设计纳米结构以控制这些状态的方法。这种优化的纳米结构可以作为研究新物理和开发新技术的基础。该项目的研究生和本科生都接受了最先进的合成技术以及光学光谱学的培训，光学光谱学提供了对单个纳米结构内的能量状态及其相互作用的敏感测量。

Non-Technical Abstract:This project is to research the properties of artificially grown nanostructures which have the special property that they have very strong spin interactions. There is tremendous interest in using such materials as a basis for using the quantum nature of spin states in computers, because these materials allow control and manipulation of the spins using either applied magnetic or electric fields. The research group in this project uses ultrafast laser pulses in the mid-infrared to measure the dynamics of these electronic states in single nanowires in order to understand what fundamental interactions dominate their behavior. With this information the group can optimize the physical nanostructure for specific properties which can be used in both fundamental physics and also for new technologies. This project involves training undergraduate and graduate students in state-of-the art techniques for fabricating and measuring nanostructures which is considered a critical need for the future economic growth in the United States.Technical Abstract:This project is to research the properties of semiconductor nanowire heterostructures which have large spin-orbit interactions, which usually are also materials with small band gaps. These materials are considered important candidates as a basis for development of spintronic devices because the spin states can be controlled and manipulated using applied magnetic and electric fields. The research group uses pump-probe measurements of the Rayleigh scattering efficiency in the mid-infrared from single nanowires in order to probe the electronic states and their dynamics in applied electric and magnetic fields. The fundamental goal of this research is to understand what fundamental interactions in the nanostructure control their dynamics in order to find ways to design the nanostructure in order to control these states. Such optimized nanostructures can be used as a basis for the study of new physics and the development of new technologies. Both graduate and undergraduate students in this project are trained in state-of-the-art synthesis techniques as well as optical spectroscopies which provide sensitive measure of energy states and their interactions within single nanostructures.