AI 中文总结
研究一维量子环中自旋相关量子输运，基于散射矩阵框架，利用太赫兹场实现高精度自旋通道切换，借助电子游标效应产生选择性自旋相位旋转器等，提供热免疫、高速替代传统半导体静态自旋晶体管的方案。
AI 中文摘要
在基于长度规范的高频弗洛凯 - 马格努斯形式主义的散射矩阵（$S$矩阵）框架内，我们研究了具有不对称（$\pi/2$）量子点接触配置的一维量子环中的自旋相关量子输运。我们展示了在零静态磁场下工作的具有铁磁引线的达塔 - 达斯自旋场效应晶体管的非接触电磁模拟的实现。结果表明，非共振太赫兹（THz）场能够在不改变纳米结构静态参数的情况下，在自旋通道之间实现高精度切换。由电子游标效应驱动，不对称几何结构中的量子干涉产生了一个选择性自旋相位旋转器以及超高对比度电流抑制机制（“光快门”）。所提出的架构从根本上对多光子泄漏边带具有鲁棒性，为传统半导体静态自旋晶体管提供了一种热免疫、高速的替代方案。
英文摘要
Within the scattering matrix ($S$-matrix) framework adapted to the high-frequency Floquet--Magnus formalism based on the length gauge, we investigate spin-dependent quantum transport in a 1D quantum ring with an asymmetric ($π/2$) configuration of quantum point contacts. We demonstrate the realization of a contactless electromagnetic analog of the Datta--Das spin field-effect transistor with ferromagnetic leads operating at zero static magnetic field. It is shown that an off-resonance terahertz (THz) field enables high-precision switching between spin channels without altering the static parameters of the nanostructure. Driven by an electronic Vernier effect, the quantum interference in the asymmetric geometry yields a selective spin phase rotator alongside an ultra-high-contrast current-suppression regime (``optical shutter''). The proposed architecture is fundamentally robust against multiphoton leakage sidebands, offering a thermally immune, high-speed alternative to conventional semiconductor static spin transistors.
Comments69 pages, 5 figures. Contains extensive analytical derivations within the text and detailed Appendices on the gauge-invariant high-frequency approximation and non-Hermitian determinant factorization
