非共线反铁磁体Mn₃Sn中的风车自旋动力学及其诱导的反常霍尔效应
Windmill Spin Dynamics and Its Induced Anomalous Hall Effect in Noncollinear Antiferromagnet Mn3Sn
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中文总结 AI 辅助
本研究揭示非共线反铁磁体Mn₃Sn存在特殊软本征模式，其风车型进动可产生特征静态反常霍尔效应，为该类材料的动力学研究提供了新认识。
中文摘要 AI 辅助
我们证明，非共线反铁磁体Mn₃Sn的自旋动力学具有一种特殊的软本征模式：当倾斜角超过由自旋序弯曲决定的阈值时，该模式会从小角度振荡发展为大角度的风车型进动。这种风车进动具有独特的手性运动方向，可被电子感知，在混合参数空间中通过贝里连接极化率产生贝里曲率。即使平衡自旋序产生的反常霍尔效应消失，这种贝里曲率仍会在风车进动期间产生特征性的静态反常霍尔效应。本研究揭示了非共线反铁磁体中丰富的动力学信息。
英文摘要
We demonstrate that the spin dynamics of the noncollinear antiferromagnet Mn3Sn hosts a soft eigenmode that transitions from small-angle oscillation to a large-angle, chiral windmill precession once the canting angle exceeds a threshold set by the bending of the spin order. This windmill precession has a fixed chirality of motion, which couples to conduction electrons via a Berry connection polarizability in the mixed space of momentum and spin order, generating a nonzero Berry curvature. This Berry curvature produces a time-independent, DC anomalous Hall effect that persists throughout windmill precession, in sharp contrast to the vanishing Hall response of the static equilibrium spin order when the Hall plane coincides with the Kagome plane. Our results establish a direct link between spin group symmetry, nonlinear spin dynamics, and quantum geometric transport in noncollinear antiferromagnets.
