具有stubs结构量子波导中电子的自旋传输特性（英文）  

Spin-dependent electron transport properties of quantum waveguide systems with attached stubs

作　　者：徐中辉[1] 姜芸[2] 李艳玲[1] 黄劲松[1] 陈宇光[3] 

机构地区：[1]江西理工大学信息工程学院,江西赣州341000 [2]西安交通大学理学院,陕西西安710049 [3]同济大学物理科学与工程学院,上海200092

出　　处：《量子电子学报》2016年第5期628-634,共7页Chinese Journal of Quantum Electronics

基　　金：Supported by National Natural Science Foundation of China,11447118,11247032,11365011;Youth Science Foundation of Science and Technology Department of Jiangxi Province,20151BAB212004,20151BAB212012~~

摘　　要：利用递归格林函数法研究了含Rashba自旋轨道耦合效应的具有stubs结构量子波导中电子的自旋极化传输特性。结果表明在含一个stub的量子波导系统中,由于stub和Rashba自旋轨道耦合引起的势阱导致系统电导出现Fano共振形式的"山谷"和"针尖"结构,通过改变自旋轨道耦合的强度可以调节它们的大小。同时,在同样的位置自旋极化率也出现Fano共振或反共振结构。当系统中出现多个周期性的stubs时,在Fano共振点附近电导中出现一些小的带隙结构。但是,当系统加上磁场后,stubs和自旋轨道耦合带来的效应都被抑制,系统的电导重新出现量子化台阶结构。由于子带间干涉效应变小,自旋电导也出现台阶结构.The spin-dependent electron transport properties of quantum waveguide systems with attached stubs in the presence of Rashba spin-orbit coupling（SOC） by recursive Green function（RGF） method are theoretically studied.In the single-stub Rashba SOC quantum waveguide system,the dip-like structure and valley-like structure emerge in the charge conductance spectra due to the stub-induced potential well and SOC-induced potential well.In addition,the peaks of the dip-like and valley-like structure can be controlled by changing the strength of Rashba SOC.At the same time,a series of resonant peaks and dips occur in the charge conductance and spin conductance,at the energies that correspond to the quasi-bound states in the stubs.Moreover,due to the presence of multiple modes and the mode-mixing effect as the number of stubs increases,there are some mini-bands exist in the charge conductance and spin polarization.However,the quantization plateau is gradually recovered,a set of resonances occurs in the charge conductance and spin conductance at the threshold of every transmitted mode when the system is in the presence of an electromagnetic field.

关 键 词：量子物理 自旋传输特性 递归格林函数法 stubs量子波导 

分 类 号：O562.5[理学—原子与分子物理]