论文标题
通过临床筛选增强稀释磁合金中自旋荷兰转换的增强
Enhancement of Spin-charge Conversion in Dilute Magnetic Alloys by Kondo Screening
论文作者
论文摘要
我们得出了一个动力学理论，能够在稀磁合金中处理大型自旋轨道耦合和围质筛选。我们非扰动地获得碰撞积分，并发现与杂质散射S-Matrix的动量导数成正比的贡献。后者对自旋扩散和自旋递增转换系数进行了重要的校正，并完全捕获所谓的侧跳过程，而无需诉诸于天生的近似值（对于谐振散射而失败），或者其他启发式派生。我们将动力学理论应用于具有强旋轨的量子杂质模型，该模型捕获了合金中的近孔层质杂质的最重要特征，例如la $ _ $ _ {1-x} $ cu $ _6 $。我们发现1）仅取决于费米波数的零温度旋转电导率和2）一种修改标准FICK扩散定律的横向自旋扩散机制。我们的预测很容易通过具有临界杂质的金属合金中的标准自旋传输测量来验证。
We derive a kinetic theory capable of dealing both with large spin-orbit coupling and Kondo screening in dilute magnetic alloys. We obtain the collision integral non-perturbatively and uncover a contribution proportional to the momentum derivative of the impurity scattering S-matrix. The latter yields an important correction to the spin diffusion and spin-charge conversion coefficients, and fully captures the so-called side-jump process without resorting to the Born approximation (which fails for resonant scattering), or to otherwise heuristic derivations. We apply our kinetic theory to a quantum impurity model with strong spin-orbit, which captures the most important features of Kondo-screened Cerium impurities in alloys such as La$_{1-x}$Cu$_6$. We find 1) a large zero-temperature spin Hall conductivity that depends solely on the Fermi wave number and 2) a transverse spin diffusion mechanism that modifies the standard Fick's diffusion law. Our predictions can be readily verified by standard spin-transport measurements in metal alloys with Kondo impurities.
