项目名称: III-V族半导体异质结构二维电子气的自旋输运特性
项目编号: No.61264006
项目类型: 地区科学基金项目
立项/批准年度: 2013
项目学科: 无线电电子学、电信技术
项目作者: 周文政
作者单位: 广西大学
项目金额: 50万元
中文摘要: 本项目拟采用深低温、强磁场下的磁输运测试方法,研究III-V族半导体异质结二维电子气中的零场自旋分裂及自旋输运特性。主要包括:通过磁输运测试,观察III-V 族半导体异质结二维电子气由零场自旋分裂引起的磁电阻Shubnikov-de Haas(SdH) 振荡的拍频效应和磁电阻在低磁场部分的反弱局域( weak antilocalization-WAL)效应,以及zeeman效应对磁电阻曲线在高磁场部分的调制,电子电子相互作用量子干涉对整个磁电阻曲线的调制,获得零场自旋分裂能、自旋轨道相互作用常数等参数,以及自旋轨道耦合常数随二维电子气相关参数的变化关系,据此研究III-V族半导体的自旋输运相关特性。这项研究结果不仅能进一步揭示III-V族半导体自旋分裂的物理机制,而且能为利用自旋轨道相互作用的自旋器件的实现提供重要的物理参数及自旋量子调控规律。
中文关键词: III-V族异质结构;二维电子气;磁输运;自旋分裂;量子调控
英文摘要: The spin related transport properties of the two-dimensional electron gases (2DEGs) in III-V semiconductor heterostructures will be investigated by means of magneto-transport measurements. The weak antilocalization (WAL) effects of 2DEGs in III-V semiconductor heterostructures as well as beating patterns in the Shubnikov-de Haas (SdH) oscillatory magnetoresistance induced by zero-field spin splitting will be observed. Meanwhile, the effects of zeeman spin splitting on magnetoresistance in high field range, as well as the effects of electron-electron interaction (EEI) on magnetoresistance in the whole applied magnetic field, will also be observed. The zero-filed spin splitting and spin-orbit coupling constant of 2DEGs will be obtained. The relation between the spin-orbit coupling constant and the 2DEGs parameters will be investigated. The original mechanisms for the spin splitting of the 2DEGs in III-V semiconductor heterostructures will be determined. The results of this research will offer valuable parameters and rules of spin quantum control which are useful for the realization of spintronic devices.
英文关键词: III-V semiconductor heterostructures;two-dimensional electron gases;magneto-transport;spin splitting;quantum control