Spin-Orbit Scattering Effects on Hall Conductivity in a Layered Disordered Electron System  

无序电子系统中自旋轨道散射对Hall电导率的影响(英文)

作　　者：王勇刚[1] 杨永宏[1] 

机构地区：[1]东南大学物理系,南京210096

出　　处：《Journal of Southeast University(English Edition)》2002年第2期191-196,共6页东南大学学报（英文版）

基　　金：TheprojectsupportedtheNationalNaturalScienceFoundationofChina(198740 11)

摘　　要：Spin-orbit scattering effects in a layered quasi-2D disordered electron system have been investigated by the diagrammatic techniques in perturbation theory. The expression of Cooperon (propagator in particle-particle channel) is obtained as the function of interlayer coupling. The analytical result for the quantum correction to Hall conductivity has been obtained as functions of elastic, inelastic and spin-orbit scattering times. It is shown that the strong and weak couplings correspond, respectively, to the 3D and 2D situations. The Hall coefficient is shown to vanish. The relevant dimensional crossover behavior from 3D to 2D with decreasing the interlayer coupling has been discussed, and the condition for the crossover has been obtained. The present theory is expected to apply for the electronic transport in tunneling superlattices.利用微扰论中的图形技术讨论了层状准二维无序电子系统中自旋轨道散射效应的有关问题 .得到作为层间耦合函数的Cooperon(粒子粒子通道的传播函数 )的表达式 ,以及对Hall电导率量子相干修正的解析表达式 ,它是弹性、非弹性和自旋轨道散射时间的函数 .强耦合和弱耦合分别对应于三维和二维的情况 .Hall系数变为零 .此外还讨论了随层间耦合的减小由三维到二维的维度跨越行为和维度跨越的条件 .

关 键 词：layered system WEAK-LOCALIZATION Hall conductivity spin-orbit scattering 

分 类 号：O482.4[理学—固体物理]