AI 中文总结
研究在极性外尔铁磁体PrAlGe中，通过非中心对称导体固有的贝里相位机制实现涌现电磁感应，施加交流电产生自旋轨道扭矩驱动磁化动力学，涌现环形矩的时间导数感应出霍尔电压，为EEMI提供证据，统一了相关概念并开辟自旋 - 电荷转换途径。
AI 中文摘要
自旋轨道耦合（SOC）通过电产生自旋扭矩支撑现代自旋电子学。其相反过程，即磁化动力学通过自旋相关的贝里相位产生电动势，被称为涌现电磁感应（EEMI）。此前仅在具有空间梯度的磁结构中观察到这种效应。本文证明，即使是空间均匀的铁磁体也能通过非中心对称导体固有的一种前所未有的贝里相位机制实现EEMI。在极性外尔铁磁体PrAlGe中，施加的交流电产生自旋轨道扭矩驱动集体磁化动力学。产生的涌现环形矩（T = P×M），其时间导数（dT/dt）感应出霍尔电压。这一贡献特别出现在交流霍尔响应的异相分量中且与频率线性相关，为EEMI提供了直接证据。第一性原理计算进一步揭示，这个环形矢量编码了动量空间中外尔节点的集体运动。这些发现确立了“涌现环形感应”作为自旋轨道纠缠的一种新表现形式，统一了贝里相位、拓扑和自旋动力学，同时为内在且节能的自旋 - 电荷相互转换开辟了道路。
英文摘要
Spin-orbit coupling (SOC) underpins modern spintronics by enabling the electrical generation of spin torques. Its reciprocal counterpart, in which magnetization dynamics produce electromotive forces through a spin-dependent Berry phase, is known as emergent electromagnetic induction (EEMI). However, this effect has previously been observed only in magnetic textures with spatial gradients, such as domain walls, helices, and skyrmions. Here, we demonstrate that even a spatially uniform ferromagnet can host EEMI through a previously unrecognized Berry-phase mechanism inherent to noncentrosymmetric conductors. In the polar Weyl ferromagnet PrAlGe, an applied alternating current generates spin-orbit torques that drive collective magnetization dynamics. The resulting emergent toroidal moment (T = P \times M), where (P) is the crystal's polar axis and (M) is the net magnetization, acts as a gauge potential whose time derivative (dT/dt) induces a Hall voltage. This contribution appears specifically in the out-of-phase component of the AC Hall response and scales linearly with frequency, providing direct evidence for EEMI. First-principles calculations further reveal that this toroidal vector encodes the collective motion of Weyl nodes in momentum space. These findings establish "emergent toroidal induction" as a new manifestation of spin-orbit entanglement, unifying Berry phase, topology, and spin dynamics while opening a pathway toward intrinsic and energy-efficient spin-charge interconversion.
Comments35 pages, 4 figures, 2 extended figures
