InSb-Based Electron and Hole Systems for Charge and Spin Transport Experiments

技术：本项目是研究由铟锑化合物(InSb)制成的半导体量子阱的生长，并研究这些材料所带来的电荷和自旋输运现象。它试图通过关注具有高载流子迁移率、小有效质量和大自旋轨道效应的InSb材料来满足未来计算机技术的需求。这些属性意味着场效应晶体管的运行速度更高，弹道传输设备的运行温度更高，自旋电子器件可能为计算和数据存储提供新的途径。逻辑应用中的晶体管都需要具有高载流子迁移率的n型和p型量子阱。该项目将通过层间缺陷过滤和应变平衡势垒和势垒层的合理设计来优化所提出的在GaAs和Si衬底上的变质异质结构的电学性能。最大应变对于p型量子阱尤其重要，在p型量子阱中，小的有效质量，因此高的迁移率，取决于价带中简并被解除的程度。设计了磁光实验来表征应变和限制对InSb中空穴有效质量的影响。量子阱生长的优化将使通过弱反局域实验、载流子聚焦装置和自旋干涉仪来研究强自旋轨道耦合效应成为可能。非技术性：该项目解决了材料科学中具有高度技术相关性的热门领域的基础研究问题，并有望为不仅是InSb，而且是闪锌矿半导体的自旋轨道耦合提供新的科学理解。俄克拉荷马大学的这个研究小组是世界上仅有的两个能够生长出许多科学家在基础物理和材料科学研究中所需的高质量InSb异质结构的小组之一。该项目还将帮助学生，包括任职人数不足的群体的成员，为在具有技术重要性的领域就业做好准备。

Technical: This project is to study the growth of semiconductor quantum wells made of indium antimonide (InSb) and to study charge and spin transport phenomena that are enabled by these materials. It attempts to address the needs of future computer technologies by focusing on InSb materials, which possess high carrier mobilities, small effective masses, and large spin-orbit effects. Such attributes imply higher operating speeds for field-effect transistors, higher operating temperatures for ballistic transport devices, and the opportunity for spintronic devices that could provide new routes for computation and data storage. Both n-type and p-type quantum wells with high carrier mobilities are required for transistors in logic applications. The electrical properties of the proposed metamorphic heterostructures, on GaAs and Si substrates, will be optimized in this project through defect filtering by interlayers and judicious design of strain-balanced barrier and well layers. Maximum strain is particularly important for p-type quantum wells, where a small effective mass, and consequently a high mobility, relies on the degree to which degeneracy is lifted in the valence bands. Magneto-optics experiments are designed to characterize the effects of strain and confinement on the effective mass of holes in InSb. The optimization of the growth of quantum wells will make possible studies of strong spin-orbit coupling effects via weak anti-localization experiments, carrier focusing devices, and spin interferometers.Non-technical: The project addresses basic research issues in a topical area of materials science with high technological relevance, and is expected to provide new scientific understanding of spin-orbit coupling of not only InSb, but zinc blende semiconductors in general. The research group at the University of Oklahoma is one of the only two groups worldwide who are able to grow high-quality InSb heterostructures needed by many scientists in studying fundamental physics and materials science. This project will also contribute to the preparation of students, including members of underrepresented groups, for employment in areas of technological importance.