GaAs半导体及其量子阱中电子自旋输运动力学的飞秒吸收光谱研究

项目名称： GaAs半导体及其量子阱中电子自旋输运动力学的飞秒吸收光谱研究

项目编号： No.11274399

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 数理科学和化学

项目作者： 赖天树

作者单位： 中山大学

项目金额： 93万元

中文摘要： 自旋输运是半导体自旋电子学中的重要基本问题之一。输运动力学决定了自旋电子器件的速度和尺度，从而决定其实用价值。本项目拟发展三种基于吸收饱和效应测量的高灵敏度的、实验装置和操作简单的、能同时直接测量自旋扩散系数和迁移率的自旋输运动力学实验测试新技术、理论模型及实验装置，并用于（001）和（110）GaAs及其量子阱中自旋库仑拖拽效应和自旋输运动力学各向异性等基本物理问题及其电子浓度、自旋极化度、温度和磁场强度等依赖性研究。弄清这些自旋输运动力学中的基本物理问题的物理起源，为实现自旋输运动力学的调控和大尺度自旋输运自旋电子器件设计提供基础数据。同时，基于我们的高灵敏度实验探测新技术，期待发现新的自旋输运相关现象。研究成果既具有重要科学意义，又具有重大的实用价值。

中文关键词： 自旋输运；瞬态圆二色吸收光谱；GaAs及其量子阱；瞬态自旋光栅；自旋库仑拖拽效应

英文摘要： Spin transport is one of important fundamental issues in semiconductor spintronics. Transport dynamics determines the speed and size of spintronic devices, and hence their applicability. In this project, three kinds of new absorption saturation-based measurement techniques, their models and experiemntal setups will be developed. Those techniques have the advantages including high detection sensitivity, simple setup and operation, and the ability to simultaneously measure spin diffusion coefficient and mobility. They are also used to study the basic physical issues, such as spin Coulomb drag effect and anisotropic spin transport dyanmics in (001)- and (110)-grown GaAs and quantum wells, and their dependences on excited electron density, the degree of spin polarization, temperature and a magnetic field etc so that their physical origin can be understood and basic data can be collected and provided for the control of spin transport dynamics and design of large-scale transport spintronic devices. Meanwhile, it is also expected that some new spin transport phenomena can be found by means of our high sensitivity detection techniques. The achievements obtained are important both in science and in applications.

英文关键词： spin transport；transient circular dichromatic absorption spectro.；GaAs and its quantum wells；transient spin grating；spin Coulomb drag effect