Antiparallel Spin Polarization Induced by Current in a Bilayer
Antiparallel Spin Polarization Induced by Current in a Bilayer
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双层中电流引起的反平行自旋极化
DOI：
10.1002/pssb.202300237
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
H. Akera
中科院分区：
文献类型：
--
作者：
Takahiro Kato;H. Akera
通过求解弛豫时间近似下层赝自旋空间中分布算符的Boltzmann方程，计算了反平行Rashba有效磁场作用下反平行电流诱导自旋极化（CISP）.反平行CISP的解析形式，获得恒定的动量弛豫时间在大费米能量的限制，表现出第二个因素的增加，增加层间隧道强度。这种增加源于修正（半经典CISP）创建的子带混合由于动量依赖的Rashba有效磁场。反平行CISP的层间耦合依赖性被成功地解释为层赝自旋Hanle效应，其中原始Hanle效应中的自旋被层赝自旋取代。目前的研究结果表明，带混合的校正可以在各种系统的输运性质与动量依赖的有效磁场是显着的。
The antiparallel current‐induced spin polarization (CISP) in an inversion‐symmetric double‐quantum‐well structure with the antiparallel Rashba effective magnetic field is calculated by solving the Boltzmann equation which is derived for the distribution operator in layer‐pseudospin space in the relaxation‐time approximation. The antiparallel CISP in an analytical form, obtained for constant momentum relaxation time in the limit of large Fermi energy, exhibits factor‐two increase with increasing the interlayer‐tunneling strength. This increase originates from the correction (to the semiclassical CISP) created by the subband mixing due to the momentum dependence of the Rashba effective magnetic field. The present interlayer‐coupling dependence of the antiparallel CISP is successfully explained as the layer‐pseudospin Hanle effect in which the spin in the original Hanle effect is replaced by the layer pseudospin. The present finding suggests that the correction by band mixing can be significant in the transport properties of various systems with the momentum‐dependent effective magnetic field.