反铁磁斯格明子的非线性拓扑轨道响应
Nonlinear Topological Orbital Responses of Antiferromagnetic Skyrmions
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中文总结 AI 辅助
本文预测反铁磁斯格明子在无自旋轨道耦合的PT对称六方反铁磁体中产生非线性拓扑轨道响应，通过涌现洛伦兹力产生与电场二次相关的轨道霍尔电流和积累，其对称性支持整流检测并区别于量子区效应。
中文摘要 AI 辅助
反铁磁斯格明子避免了斯格明子霍尔效应，但其补偿作用抑制了其传统的拓扑电荷霍尔信号。我们预测了在无自旋轨道耦合的$\mathcal{PT}$对称六方反铁磁体中，孤立斯格明子存在半经典非线性拓扑轨道响应。在扩散、弱涌现场区域，自旋相关的涌现洛伦兹力重塑了载流子分布，产生了局域轨道霍尔电流修正和局域轨道积累，两者均与外加电场呈二次关系。电流修正需要自旋不对称的纵向散射，而积累在自旋对称散射下仍然存在。当自旋扩散长度远大于条带宽度时，电流修正持续存在而积累趋于零。两种信号在电场反转下均为偶对称，在斯格明子拓扑电荷$Q$反转下为奇对称，且在此模型内与螺旋性无关。这些对称性使得整流检测成为可能，并将该机制与$Q$偶对称的量子区拓扑轨道霍尔效应区分开来。
英文摘要
Antiferromagnetic skyrmions evade the skyrmion Hall effect, but compensation suppresses their conventional topological charge Hall signal. We predict a semiclassical nonlinear topological orbital response of an isolated skyrmion in a $\mathcal{PT}$-symmetric hexagonal antiferromagnet without spin-orbit coupling. In the diffusive, weak-emergent-field regime, the spin-dependent emergent Lorentz force reshapes the carrier distribution, generating a local orbital Hall-current correction and a local orbital accumulation, both quadratic in the applied electric field. The current correction requires spin-asymmetric longitudinal scattering, whereas the accumulation survives spin-symmetric scattering. When the spin-diffusion length greatly exceeds the strip width, the current correction persists while the accumulation approaches zero. Both signals are even under electric-field reversal, odd under reversal of the skyrmion topological charge $Q$, and helicity independent within this model. These symmetries enable rectified detection and distinguish this mechanism from the $Q$-even quantum-regime topological orbital Hall effect.
发表机构
- Institute for Advanced Studies in Basic Sciences (IASBS)（基础科学高等研究院）
- Norwegian University of Science and Technology（挪威科技大学）
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