量子点体系中自旋过滤、自旋流产生和自旋注入  

Effect of spin-orbit interaction on the spin transport of quantum dot systems

作　　者：郭永[1] 吕海峰[2] 

机构地区：[1]清华大学物理系,北京100084 [2]电子科技大学应用物理系,成都610054

出　　处：《中国科学：物理学、力学、天文学》2011年第4期382-389,共8页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家自然科学基金(批准号:10974109;11004022;61006081);高等学校博士学科点专项科研基金(编号:20100002110079);国家重点基础研究发展计划(编号:2011CB606405);中央高校基础科研业务金费(编号:ZYGX2009J042)资助项目

摘　　要：自旋电子学是一门新兴的交叉学科,其中心主题就是对固体电子系统中电子的自旋自由度进行有效地操作和控制.量子点体系中的自旋效应近期受到了理论和实验较多的关注.本文着重介绍了自旋轨道耦合效应对量子点体系输运性质的影响,探讨了怎样利用自旋轨道耦合效应来实现对自旋的有效过滤和纯自旋流产生.基于四铁磁端双量子点体系中电子的交换相互作用机制,指出了一种可以显著提高从铁磁金属到半导体量子点自旋注入效率的新方法.Spintronics is an emerging cross-disciplinary, and its central theme is that of solid electronic systems for effective electronic spin degree of freedom to operate and control. Spin effect in quantum dot system has attracted considerable attention theoretically and experimentally. This paper introduces the effect of spin-orbit interaction on the transport properties of quantum dot system, and to explore how to use spin-orbit coupling to achieve effective filtering of spin and pure spin current generation. Based on the mechanism of the exchange interaction between electrons in a double quantum dot system coupled with four ferromagnetic metals, we propose a way to enhance the injection efficiency of spin-polarized current from ferromagnetic metal into semiconductor quantum dot.

关 键 词：量子点 自旋轨道耦合 自旋流 自旋注入 

分 类 号：O471.1[理学—半导体物理]