Optical and Electrical Control of Magnetism and Magneto-Optical Response in Semiconductor Nanoparticles and Nanoparticle Devices

半导体纳米颗粒和纳米颗粒器件中磁性和磁光响应的光电控制

• 批准号: 214348296
• 负责人: Professor Dr. Gerd Bacher
• 金额: --
• 依托单位: Lehrstuhl Werkstoffe der Elektrotechnik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/214348296?language=en
• 关键词: Optical; Electrical; Control; Magnetism; Magneto

One key challenge in applied science and engineering is the realization of materials and devices with combined electrical, magnetic and optical functionality at room temperature. The central goal of the project is to work out a fundamental understanding of the magnetooptical properties in colloidal, magnetically doped semiconductors (quantum dots, nanocluster, nano ribbons) and finally to develop schemes for achieving electrical and optical control of magnetism and magnetooptical functionality. Hereby, we profit from the worldwide unique nanomaterials prepared by our key partners, Prof. Hyeon, U Seoul, and Prof. Gamelin, U Washington. The main scientific objectives can be divided into two closely connected subgoals. The first sub-goal is to demonstrate electrically controlled magneto-optical functionality via carrier-induced modification of the spin alignment of transition metal dopants. For that purpose, magnetically doped nanocrystals will be incorporated into device schemes allowing electrical injection of either electrons or holes, or both. This, e.g., enables a separate identification of the interaction between electrons and holes, respectively, with magnetic dopants. The second sub-goal developed from our recent results on digitally doped nanoclusters and quantum dots. Hereby, the ultimate limit of semiconductor doping will be addressed by investigating single nanocrystals doped with a controlled number of doping atoms down to the level of one. This points towards the newly developed research field of solotronics, where single doping atoms control functionality. Together with our project partners we intend to extend the dilute magnetic semiconductor nanomaterial family by alternative architectures (core-shell design, magic-sized cluster) and novel dopants (Co, Cu, in addition to Mn), including co-doping with, e.g. Ag, for adding additional charge carriers on purpose. We expect that the strong quantum and dielectric confinement in these shape and size engineered nanomaterials increase the energy scale of exchange effects largely (about one to two orders of magnitude) with respect to their epitaxially grown counterparts, paving the way to room temperature functionality.

应用科学和工程的一个关键挑战是在室温下实现具有电，磁和光学功能的材料和设备。该项目的中心目标是对胶体磁掺杂半导体（量子点，纳米团簇，纳米带）的磁光特性进行基本了解，并最终开发实现磁性和磁光功能的电气和光学控制的方案。因此，我们从我们的主要合作伙伴Hyeon教授，U首尔和Gamelin教授，U华盛顿准备的全球独特的纳米材料中获益。主要科学目标可分为两个密切相关的次级目标。第一个子目标是通过载流子诱导的过渡金属掺杂剂的自旋取向的改性来证明电控磁光功能。为此，磁性掺杂的纳米晶体将被纳入允许电子或空穴或两者的电注入的器件方案中。例如，使得能够分别单独识别电子和空穴与磁性掺杂剂之间的相互作用。第二个子目标是从我们最近关于数字掺杂纳米团簇和量子点的结果中发展出来的。因此，半导体掺杂的最终极限将通过研究掺杂有受控数量的掺杂原子的单个纳米晶体来解决。这指向了新开发的研究领域solotronics，其中单个掺杂原子控制功能。与我们的项目合作伙伴一起，我们打算通过替代架构（核-壳设计，魔法大小的簇）和新型掺杂剂（Co，Cu，除了Mn）来扩展稀磁半导体纳米材料家族，包括与Ag共掺杂，以增加额外的电荷载流子。我们预计，这些形状和尺寸工程纳米材料中的强量子和介电限制相对于其外延生长的对应物大大增加了交换效应的能量尺度（约一到两个数量级），为室温功能铺平了道路。