Manganese-Doping During Germanium Quantum Dot Self-Assembly for Spintronics Applications

该奖项由2009年美国复苏和再投资法案(Public Law 111-5)资助。技术：该项目由DMR的电子和光子材料(EPM)计划和CHE的分析和表面化学(ASC)计划资助，研究在锗量子点通过硅上异质外延自组装过程中亚稳态锰掺入的基本机制。该项目包括对Ge的磁性掺杂中的基本生长、掺入、聚集和反应过程的全面研究。表面化学工具，包括扫描隧道显微镜和低能电子显微镜，被用来获得原子尺度和介观尺度上对Ge点中掺杂Mn的理解。用磁测量的方法研究了量子点的磁性与Mn掺杂率的关系。这些研究是分层次的，评估相关应变和非应变表面上的基本传输，使用这些知识通过仔细控制动力学参数来指导优化的整合研究，然后反馈结构、化学和磁性分析。非技术性：该项目涉及与技术相关的材料和化学科学专题领域的基础研究问题。该项目的成功很可能会对自旋电子学这一新兴领域以及量子计算等相关领域的发展产生影响。研究生和本科生在包括材料科学和化学在内的跨学科环境中接受培训。此外，PI和共同PI还组织了NanoDays活动，通过多种互动向公众开放，包括现场和当地小学的演示、实验室参观和多媒体演示。

This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5).Technical: This project, funded by the Electronic and Photonic Materials (EPM) Program in DMR and by the Analytical and Surface Chemistry (ASC) Program in CHE, investigates the fundamental mechanisms controlling metastable manganese incorporation during germanium quantum dot self-assembly via heteroepitaxy on silicon. The project includes a comprehensive study of the fundamental growth, incorporation, clustering, and reaction processes in the magnetic doping of Ge with substitutional Mn. Surface chemistry tools, including scanning tunneling microscopy and low energy electron microscopy, are used to gain an atomic scale and mesoscale understanding of the doping of Mn into Ge dots. Magnetic measurements are employed to investigate the correlation between Mn incorporation and magnetic properties of quantum dots. These studies are hierarchical, evaluating fundamental transport on relevant strained and unstrained surfaces, using that knowledge to guide optimized incorporation studies through careful control of kinetic parameters, and then feeding back with structural, chemical, and magnetic analysis. Non-technical: The project addresses basic research issues in a topical area of materials and chemical sciences with technological relevance. The success of this project is likely to have impacts on the advancement of the emerging area of spintronics and related fields such as quantum computing. Graduate and undergraduate students are trained in an interdisciplinary environment that includes materials science and chemistry. In addition, the PI and co-PI organize a NanoDays event, which is open to the public with multiple interactions including demonstrations both onsite and in local elementary schools, lab tours, and multimedia presentations.