arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1104.2496cond-mat.mes-hall
收藏

$n$型(111)GaAs量子阱中的自旋扩散

Spin diffusion in $n$-type (111) GaAs quantum wells

B. Y. Sun, K. Shen

摘要:

利用动力学自旋Bloch方程方法研究了$n$型(111)GaAs量子阱中的稳态自旋扩散,其中Dresselhaus自旋轨道耦合项和Rashba项的面内分量可以部分相互抵消.在垂直电场依赖性中预测了由于抵消而导致的自旋扩散长度的峰值。结果表明,通过温度和掺杂可以显著地控制峰附近的自旋扩散长度。当电子气进入简并区时,电子密度对强抵消区的自旋扩散也有明显的影响。此外,我们发现自旋扩散总是呈现出强的各向异性相对于注入的自旋极化的方向。自旋各向异性扩散取决于电场是否远离或处于强抵消区。

英文摘要:

We utilize the kinetic spin Bloch equation approach to investigate the steady-state spin diffusion in $n$-type (111) GaAs quantum wells, where the in-plane components of the Dresselhaus spin-orbit coupling term and the Rashba term can be partially canceled by each other. A peak of the spin diffusion length due to the cancellation is predicted in the perpendicular electric field dependence. It is shown that the spin diffusion length around the peak can be markedly controlled via temperature and doping. When the electron gas enters into the degenerate regime, the electron density also leads to observable influence on the spin diffusion in the strong cancellation regime. Furthermore, we find that the spin diffusion always presents strong anisotropy with respect to the direction of the injected spin polarization. The anisotropic spin diffusion depends on whether the electric field is far away from or in the strong cancellation regime.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑