Exploring the role of bound magnetic polaron like formations in tunneling transport

探索类束缚磁极化子结构在隧道传输中的作用

• 批准号: 40956767
• 负责人: Privatdozent Dr. Charles Gould
• 金额: --
• 依托单位: Lehrstuhl für Experimentelle Physik III
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2007
• 资助国家: 德国
• 起止时间: 2006-12-31 至 2014-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/40956767?language=en
• 关键词: Exploring; role; bound; magnetic; polaron

The research project is focused on low dimensional resonant tunneling diodes based on all II-VI semiconductor heterostructures, where the reduced dimensionality is not imposed on the true current path, but rather by local environment. Spin filtering through resonant tunneling transport has already been established in two geometries: resonant transport through a paramagnetic quantum well at high fields, and resonant transport through quantum dots, even at zero magnetic field, when the dots are coupled to a paramagnetic environment. As our preliminary work shows, the best features these two geometries can be united, as interface formations in a quantum well lead to the formation of bound magnetic polaron like formations which cause the transport to effectively break up into an ensemble of effectively 0D channels which exhibit zero field spin splitting. The project aims to explore this phenomenology and assess its repercussions for spintronics devices.

本课题主要研究基于全II-VI半导体异质结构的低维谐振隧道二极管，其降维不是强加于真实电流路径，而是由局部环境决定的。共振隧穿输运的自旋滤波已经在两种几何形状中建立：在高磁场下通过顺磁量子阱的共振输运，以及当量子点耦合到顺磁环境时，即使在零磁场下通过量子点的共振输运。正如我们的初步工作所表明的那样，这两种几何形状的最佳特征可以结合在一起，因为量子阱中的界面形成导致形成束缚的磁性极化子形成，从而导致输运有效地分解成有效的0D通道集合，这些通道表现出零场自旋分裂。该项目旨在探索这种现象，并评估其对自旋电子学设备的影响。