圆偏振光激发的反常霍尔效应研究

项目名称： 圆偏振光激发的反常霍尔效应研究

项目编号： No.61474114

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 陈涌海

作者单位： 中国科学院半导体研究所

项目金额： 84万元

中文摘要： 非磁自旋电子器件已经成为目前自旋电子学研究中的一个重要方向。自旋轨道耦合效应产生的有效磁场为非磁自旋电子器件的研制奠定了基础。最能体现自旋轨道耦合作用的一个重要自旋现象是自旋霍尔效应（SHE）。然而由于自旋流观测上的困难，SHE并没有得到系统的实验研究，SHE外禀和内禀机制及其决定因素尚不清楚。电场驱动圆偏光激发载流子运动产生的光致反常霍尔效应（PAHE）与SHE具有相同的物理机制，PAHE产生的电荷流便于测量，解决了SHE难于表征的问题。本项目通过量子限制、晶向、应变及电场与PAHE光谱相互关系的研究，阐明主导PAHE和SHE的微观机制和关键物理因素；基于PAHE光谱技术，研究半导体量子结构的自旋输运行为，实现对自旋轨道耦合和自旋性质的有效调控，为自旋电子器件研制奠定基础。

中文关键词： 半导体低维结构；自旋轨道耦合；自旋霍尔效应；光致反常霍尔效应；自旋输运

英文摘要： The design of spintronics devices has been an important direction and hotspot of spintronics. The effective magnetic field generated by spin-orbit coupling is the foundation of the design of spintronics devices. One of important spin phnomena related to spin-orbit coupling is spin Hall effect. However, due to the difficulty in measuring of spin current, there is no systematical research on spin Hall effect, the physical mechanisms and key factors of spin Hall effect are still not clear. When spin-polarized carriers, excited by a circularly polarized light, are driven by an electric field, a transverse charge current can be generated. It is so-called photo-induced anomalous effect (PAHE), which is believed to have the same mechanism as spin Hall effect. The charge current generated by PAHE is convenient to be detected and hence can be used to characterize spin Hall effect. By the investigation of the relation between the PAHE spectra and quantum confinement, crystal orientation, strain and electric field, we try to find the key factors and the physical mechanims that affect PAHE and spin Hall effect. Based on PAHE spetra, the spin transport in low dimensional semiconductors will be studied with the aim to control the spin-orbit coupling and spin properties, by which the foundation for the fabrication of spintronics devices can be built.

英文关键词： low-dimensional semiconductors;spin-orbit coupling;spin Hall effect;photo-induced anomalous Hall effect;spin transport