Isotropic spin analysis is a key step in spintronics and could be useful in quantum information, which usually requires light as an essential component. It has not yet been realized in a solid-state device. Here, we propose an isotropic all electrical spin analyzer designed from a quantum ring with spin–orbit couplings by analytically and numerically modeling how the charge transmission rate depends on the polarization of the incident spin. The spin transport features are also demonstrated to be robust against ring structure defects, disorder, and a bias between the two leads at finite temperature in the nanoscale ring. Similar to the light polarizer/analyzer, this interesting two-dimensional electron system can be designed as a spin filter, spin polarizer, and a general spin analyzer with high resolution by simply tuning the spin–orbit couplings, which paves the way for realizing the tunable and integrable spintronics devices.

中文翻译：

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基于具有自旋-轨道耦合的量子环的各向同性全电自旋分析仪

各向同性自旋分析是自旋电子学中的关键步骤，可用于量子信息，量子信息通常需要光作为基本成分。在固态设备中尚未实现。在这里，我们提出了一种具有各向同性的全电自旋分析仪，该分析仪由具有自旋-轨道耦合的量子环设计而成，通过分析和数值建模来模拟电荷传输速率如何取决于入射自旋的极化。还证明自旋传输特征在纳米级环中在有限温度下对环结构缺陷，无序和两条引线之间的偏压具有鲁棒性。类似于光偏振器/分析仪，这个有趣的二维电子系统可以通过简单地调整自旋-轨道耦合来设计为自旋滤波器，自旋偏振器和具有高分辨率的通用自旋分析仪，