论文标题
在二维电子气体中漂移转运过程中自旋松弛各向异性的电控制
Electrical control of spin relaxation anisotropy during drift transport in a two-dimensional electron gas
论文作者
论文摘要
在限制在宽GAAS量子中的二维电子气体中研究了自旋松弛。最近，D。iizasa等人，Arxiv：2006.08253（2020）首次显示了通过扩散运动对自旋弛豫各向异性的控制。在这里，我们通过在带有两个串带占据的系统中的漂移传输来证明电气控制。使用时间分辨的Kerr旋转研究了面内和栅极电压的综合作用。测得的松弛时间相对于运输方向表现出强各向异性。对于沿$ \左[110 \右] $的平面内加速电场，无论施加的门电压如何，寿命都会被强烈抑制。值得注意的是，对于沿$ \ left [1 \ bar {1} 0 \ right] $的传输，数据显示了旋转寿命，与$ \ left [110 \右] $方向相比，无论平面伏特，旋转寿命。同时，还提出了各向异性自旋进动频率的独立结果。然而，数据中长长的自旋寿命，强各向异性和漂移响应超出了自旋漂移和扩散的现有模型。
Spin relaxation was studied in a two-dimensional electron gas confined in a wide GaAs quantum well. Recently, the control of the spin relaxation anisotropy by diffusive motion was first shown in D. Iizasa et al., arXiv:2006.08253 (2020). Here, we demonstrate electrical control by drift transport in a system with two-subbands occupied. The combined effect of in-plane and gate voltages was investigated using time-resolved Kerr rotation. The measured relaxation time present strong anisotropy with respect to the transport direction. For an in-plane accelerating electric field along $\left[110\right]$, the lifetime was strongly suppressed irrespective of the applied gate voltage. Remarkably, for transport along $\left[1\bar{1}0\right]$, the data shows spin lifetime that was gate-dependent and longer than in the $\left[110\right]$ direction regardless of the in-plane voltage. In agreement, independent results of anisotropic spin precession frequencies are also presented. Nevertheless, the long spin lifetime, strong anisotropy and drift response seen in the data are beyond the existing models for spin drift and diffusion.
