弱Dresselhaus自旋轨道耦合量子线电导(英文)  

Electronic Conductance for a Quantum Wire with Weak Dresselhaus Spin-Orbit Coupling

作　　者：段子刚[1] 付喜[2] 周光辉[2] 

机构地区：[1]深圳大学光电研究所,中国深圳518060 [2]湖南师范大学物理与信息科学学院,中国长沙410081

出　　处：《湖南师范大学自然科学学报》2010年第2期43-47,共5页Journal of Natural Science of Hunan Normal University

基　　金：科技部国际科技合作项目(2008DFA11010)

摘　　要：在有效质量自由电子近似下,用散射矩阵方法计算了两端非绝热连接正常导体电极的弱D resselhaus自旋轨道耦合量子线的自旋电导.结果表明,由于Dresselhaus自旋轨道耦合作用,系统量子化电导平台在子带边缘呈振荡特性,并依赖于自旋轨道耦合强度与电极中的传播通道数以及量子线长度.The electron transport property for a Dresselhaus spin-orbit coupling（SOC）quantum wire nonadiabatically connected to the two normal leads without SOC in a geometry of wide-narrow-wide（WNW） is investigated.Using the scattering matrix approach within the effective free-electron approximation,we have calculated the spin-dependent conductance for the system.It is demonstrated that,through a few numerical examples,the quantized conductance of the system shows quantized plateaus with oscillation at the subband edges.These transport properties can be changed by the strength of Dresselhaus SOC,the number of propagation modes in the leads and the wire length.

关 键 词：量子线 Dresselhaus自旋轨道耦合 量子化电导 

分 类 号：O413.1[理学—理论物理]