Interplay between spin and charge effects in nanostructured systems

纳米结构系统中自旋效应和电荷效应之间的相互作用

• 批准号: 328004-2006
• 负责人: Hu, CanMing
• 金额: $ 3.38万
• 依托单位: University of Manitoba
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2008
• 资助国家: 加拿大
• 起止时间: 2008-01-01 至 2009-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=397989
• 关键词: Interplay; between; spin; charge; effects

Spin and charge effects in condensed matter physics have long been studied separately. In traditional ferromagnetic materials such as Ni, Fe, and Co, spin physics defines magnetic properties, and results achieved have driven the information storage industry. For semiconductor materials such as Si and GaAs on the other hand, the research focus has been on their charge properties, and results have been applied mainly by the electronics industry. For several decades, these two major fields of condensed matter physics have had little overlap, and researchers from the two sides have seldom met and communicated.  My long-term research goal is to contribute significantly to the increasing worldwide interest of merging the two fields, and investigating the interplay between spin and charge effects in various material systems. The focus of this research program is to apply innovative experimental tools to investigate spin transport and spin dynamics in nanostructures. Based on expertise I have established over the last few years, I have set the following challenging objectives, in order to combine spintronics applications with nanotechnology:     In semiconductors, spin-orbit coupling bridges spin and charge effects at the fundamental bandstructure level. My goal is to investigate its influence on coherent charge transport in nanostructures, via the weak antilocalization effect. Our latest results have brought us considerable insight into this topic.     In ferromagnet metals, my focus is on the current-induced spin dynamics in nanomagnets, an effect that may transform the magnetic storage technology. I will use microwave photoconductivity spectroscopy, a novel technique which we have recently established, to study magnetodynamics.     A crucial step for spintronics applications is to merge semiconductor with magnetism. One approach is to make hybrid devices, the other is to use novel ferromagnetic semiconductor materials. My goal is to investigate spin dynamics in both systems, in order to pave the way for creating functional spintronics devices.

凝聚态物理学中的自旋效应和电荷效应长期以来一直被分开研究。在传统的铁磁材料中，如Ni，Fe和Co，自旋物理定义了磁特性，所取得的成果推动了信息存储行业的发展。另一方面，对于半导体材料，如Si和GaAs，研究重点一直是它们的电荷性质，并且结果主要被电子工业应用。几十年来，凝聚态物理学的这两个主要领域几乎没有重叠，双方的研究人员也很少见面和交流。我的长期研究目标是为世界范围内日益增长的将这两个领域结合起来的兴趣做出重大贡献，并研究各种材料系统中自旋和电荷效应之间的相互作用。该研究计划的重点是应用创新的实验工具来研究纳米结构中的自旋输运和自旋动力学。基于我在过去几年中积累的专业知识，我设定了以下具有挑战性的目标，以便将联合收割机自旋电子学应用与纳米技术相结合： 在半导体中，自旋-轨道耦合在基本能带结构水平上桥接自旋和电荷效应。我的目标是研究它对相干电荷输运纳米结构的影响，通过弱反局域化效应。我们最新的研究结果使我们对这个问题有了相当深入的了解。 在铁磁金属方面，我的重点是纳米磁体中的电流诱导自旋动力学，这种效应可能会改变磁存储技术。我将使用微波光电导光谱，一种新的技术，我们最近建立，研究磁动力学。 自旋电子学应用的关键一步是将半导体与磁性结合起来。一种方法是制造混合器件，另一种方法是使用新型铁磁半导体材料。我的目标是研究这两个系统中的自旋动力学，以便为创建功能性自旋电子器件铺平道路。