Materials World Network: Engineering the Spintronic Properties of Semiconductor Quantum Dots

材料世界网络：设计半导体量子点的自旋电子特性

• 批准号: 0602846
• 负责人: Jeremy Levy
• 金额: $ 44.8万
• 依托单位: University of Pittsburgh
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-05-01 至 2009-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0602846&HistoricalAwards=false
• 关键词: Materials; World; Network; Engineering; Spintronic

With this Materials World Network award to University of Pittsburgh scientists from US, Brazil, Canada and Argentina will study engineered quantum dot systems that have been specifically tailored for spintronic and quantum information applications, and is co-funded by the Electronic Materials program in the Division of Materials Research and the Americas program in the Office of International Science and Engineering. This collaborative project with scientists from University of Pittsburgh, Laboratorio Nacional de Luz Sincrotron (Brazil), University of Guelph (Canada), and University of Buenos Aires (Argentina) will develop two material systems: InAs:GaAs and Ge:Si quantum dots. Each system has unique strengths and challenges in terms of spintronic applications, and the degree with which these properties can be manipulated through growth. InAs:GaAs quantum dots will be grown using an approach that will create highly monodisperse quantum dots with densities that can be varied over two orders of magnitude. Ge:Si quantum dots will be grown using a novel approach in which SiC nanotemplates are placed controllably on the surface of Si(100), followed by "directed" self-assembly of Ge islands on the templated surface. Characterization of these dots will be performed in a variety of complementary ways, including tunneling microscopy/spectroscopy, photoluminescence/absorption spectroscopy, and capacitance-voltage measurements (to extract the g-tensor of quantum dots as well as determine the electron occupancy). High-resolution x-ray measurements will provide crucial structural information about the internal composition of the quantum dots. Prototype spintronic devices will be developed for producing, manipulating and measuring spin in quantum dots. These simple devices will be used to measure spin coherence times, g-tensor modulation resonance in single quantum dots, and test mechanisms for single electron spin readout (using spin-dependent tunneling measured at microwave frequencies).The proposed research focuses on tailoring the growth of semiconductor quantum dots in order to optimize properties for spintronic and quantum information applications. Control over the properties of quantum dots has been a foremost goal in material science over the last two decades. Spintronics and spin-based quantum information science and technology share widespread international attention, and the proposed collaboration will formalize and strengthen the ties within the Americas. Graduate students are likely to receive the greatest benefit from this international collaborative program. During their trips abroad, students will share their expertise, cultures, approaches to science, and their intellectual and cultural horizons. The bonds fostered within this exchange program are designed to endure throughout an entire professional career.

借助这项材料世界网络奖，来自美国，巴西，加拿大和阿根廷的匹兹堡大学科学家将研究经过专门针对Spintronic和量子信息应用的工程量子点系统，并由电子材料计划与国际科学和工程办公室的美洲计划和美洲计划中的电子材料计划共同资助。 这项与匹兹堡大学，实验室的科学家De Luz Sincrotron（巴西），圭尔夫大学（加拿大）和布宜诺斯艾利斯大学（阿根廷）的合作项目将开发两个物质系统：INAS：INAS：GAAS：GAAS和GE：GE和GE：SI量子点。 每个系统在自旋应用程序方面都有独特的优势和挑战，并且可以通过增长来操纵这些特性的程度。 INAS：GAAS量子点将使用一种方法来生长，该方法将产生高度单分散的量子点，其密度可以在两个数量级上变化。 GE：Si量子点将使用一种新型方法进行生长，其中SIC纳米复制物被控制在Si（100）的表面上，然后在模板表面上的GE岛的“定向”自组装。 这些点的表征将以多种互补的方式进行，包括隧道显微镜/光谱，光致发光/吸收光谱和电容 - 电容 - 电压测量值（以提取量子点的G量以及确定电子占用率）。 高分辨率X射线测量将提供有关量子点内部组成的关键结构信息。将开发原型自旋设备，用于生产，操纵和测量量子点中的自旋。 这些简单的设备将用于测量单个量子点中的旋转连贯性时间，G量调节器调节共鸣以及单电子旋转读数的测试机制（使用在微波频率下测得的自旋依赖性隧道）。该研究的重点是定制半导体量子点的生长，以使半导体量子点的生长以最佳的属性和量子的量化应用。在过去的二十年中，对量子点的性质的控制一直是材料科学的最重要目标。 Spintronics和基于旋转的量子信息科学与技术具有广泛的国际关注，拟议的合作将正式和加强美洲内部的联系。研究生可能会从这个国际协作计划中获得最大的收益。在出国旅行期间，学生将分享他们的专业知识，文化，科学方法以及知识和文化视野。该交换计划中建立的纽带旨在在整个职业生涯中忍受。