四端介观量子网络中电子自旋的相干输运性质  

Coherent Spin Transport Property of Electron in 4-Terminal Mesoscopic Quantum Network

作　　者：王会娴[1] 郝希平[1] 康大伟[1] 

机构地区：[1]河南科技大学物理与工程学院,河南洛阳471003

出　　处：《河南科技大学学报（自然科学版）》2012年第3期75-79,114,共5页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家自然科学基金项目(11147166);河南科技大学博士启动基金项目(09001262)

摘　　要：采用解线性方程组的方法,研究了存在磁通时,四端介观量子网络中电子自旋的相干输运性质。该四端网络由具有Rashba自旋-轨道耦合互作用的量子线构成,数值计算了自旋电导对约化磁通和自旋-轨道耦合强度的依赖关系。计算结果表明:该网络中的自旋相干输运性质由约化磁通和Rashba自旋-轨道耦合之间的相互作用共同决定。这种结构中,一些端可以作为栅极控制其他端的自旋流,该四端多通道网络结构为调控电子自旋的相干输运提供了更多的选择。In the presence of magnetic flux,the coherent spin transport property of electron in 4-terminal mesoscopic quantum network was studied by solving linear equations.The 4-terminal network was made of quantum wire with Rashba spin-orbit coupling interaction.It was numerically calculated to study how the spin conductance is dependent on reduced flux and spin-orbit coupling strength.The calculation results show that the coherent spin transport property of electron in the network is determined by the interplay of reduced flux and Rashba spin-orbit coupling.Some terminals in this structure can act as gates to control the spin current in other terminals.Such a 4-terminal and multi-channel structure may provide more options of controlling methods for the coherent spin transport of electron.

关 键 词：自旋相干输运 四端网络 自旋-轨道耦合 AB效应 

分 类 号：O469[理学—凝聚态物理]