Characteristics of anomalous Hall effect in spin-polarized two-dimensional electron gases in the presence of both intrinsic,extrinsic,and external electric-field induced spin-orbit couplings  

作　　者：Liu Song Yan Yu-Zhen Hu Liang-Bin 刘宋;颜玉珍;胡梁宾(Laboratory of Quantum Information Technology,School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510631,China)

机构地区：[1]Laboratory of Quantum Information Technology,School of Physics and Telecommunication Engineering,South China Normal University,Guangzhou 510631,China

出　　处：《Chinese Physics B》2012年第2期469-476,共8页中国物理B（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No.10874049)

摘　　要：The various competing contributions to the anomalous Hall effect in spin-polarized two-dimensional electron gases in the presence of both intrinsic, extrinsic and external electric-field induced spin-orbit coupling were investigated theoretically. Based on a unified semiclassical theoretical approach, it is shown that the total anomalous Hall conductivity can be expressed as the sum of three distinct contributions in the presence of these competing spin-orbit interactions, namely an intrinsic contribution determined by the Berry curvature in the momentum space, an extrinsic contribution determined by the modified Bloch band group velocity and an extrinsic contribution determined by spin-orbit-dependent impurity scattering. The characteristics of these competing contributions are discussed in detail in the paper.The various competing contributions to the anomalous Hall effect in spin-polarized two-dimensional electron gases in the presence of both intrinsic, extrinsic and external electric-field induced spin-orbit coupling were investigated theoretically. Based on a unified semiclassical theoretical approach, it is shown that the total anomalous Hall conductivity can be expressed as the sum of three distinct contributions in the presence of these competing spin-orbit interactions, namely an intrinsic contribution determined by the Berry curvature in the momentum space, an extrinsic contribution determined by the modified Bloch band group velocity and an extrinsic contribution determined by spin-orbit-dependent impurity scattering. The characteristics of these competing contributions are discussed in detail in the paper.

关 键 词：anomalous Hall effect intrinsic spin orbit coupling extrinsic spin orbit coupling exter- nal electric-field induced spin-orbit coupling 

分 类 号：O471[理学—半导体物理]