发表机构
The University of Tokyo; Institute for Molecular Science; RIKEN Center for Emergent Matter Science; Institute of Science Tokyo; National Institutes of Natural Sciences; Osaka Metropolitan University（东京大学; 分子科学研究所; 理化学研究所新兴物质科学中心; 东京科学大学; 国立自然科学研究所; 大阪公立大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文发展低频半经典玻尔兹曼理论，揭示手性金属边界附近由涨落驱动的反平行自旋极化，主要源于局域有效电场驱动的线性埃德尔斯坦效应，为无偏压下的CISS相关自旋极化提供定性解释。
AI 中文摘要
手性导体对非平衡电学涨落的自旋响应在很大程度上仍未得到探索。我们发展了一种低频半经典玻尔兹曼理论，该理论与高斯定律耦合，适用于具有刺猬型自旋轨道耦合的手性金属，并在常规弛豫时间近似之外处理杂质散射。我们首先确定对局部交流电流的二次响应及其频率依赖性，然后证明边界附近的零均值平稳电流涨落和电场涨落在手性金属的两个边界区域产生有限的时间平均自旋极化。这些极化垂直于边界且反平行：对于一种手性，它们在两个边界处指向内部；对于另一种手性，它们指向外部。在该模型内，主要贡献来自由每个边界附近局域的二次有效电场驱动的线性埃德尔斯坦效应。这一图景可能为在无外加偏压情况下报道的与CISS相关的自旋极化提供定性解释。更广泛地，我们预期其他外部维持的随机驱动会通过相同机制诱导自旋极化。
英文摘要
The spin response of chiral conductors to nonequilibrium electrical fluctuations remains largely unexplored. We develop a low-frequency semiclassical Boltzmann theory coupled to Gauss's law for a chiral metal with spin-orbit coupling of hedgehog type, treating impurity scattering beyond the conventional relaxation-time approximation. We first determine the quadratic response to a local ac current and its frequency dependence, and then show that zero-mean stationary current fluctuation and electric-field fluctuation near boundaries generate finite time-averaged spin polarizations in the two boundary regions of the chiral metal. The polarizations are normal to the boundaries and antiparallel: for one chirality they point inward at both boundaries, and for the other they point outward. Within this model, the dominant contribution arises from the linear Edelstein effect driven by a quadratic effective electric field localized near each boundary. This picture may provide a qualitative explanation for CISS-related spin polarization reported in the absence of an applied bias. More broadly, we expect other externally maintained stochastic drives to induce spin polarization through the same mechanism.
Comments29 pages, 10 figures
