AI 中文总结
本研究通过对称性分析和Floquet理论，在周期性驱动的共线反铁磁体中建立了与非常规磁性共存的Floquet自旋反铁电相，并预测其在单层MnPS₃中可实现，为超越平衡态约束的光控多铁性提供了非平衡路径。
AI 中文摘要
结合磁序和极序的多铁相为自旋和电自由度的光学控制提供了机会。在此，我们利用对称性分析和Floquet理论，在周期性驱动的共线反铁磁体中建立了一种与非常规磁性共存的Floquet自旋反铁电相，将其定性为非常规多铁体。该驱动相支持补偿的、自旋分辨的面内电极化，其方向垂直于垂直旋转轴，而这些极化在平衡态下被晶体对称性严格禁止。利用紧束缚模型，我们阐明了光偏振如何控制极序和自旋响应的出现。此外，基于第一性原理的Floquet计算预测了其在单层MnPS₃中的实现，确定了一个真实的二维反铁磁平台。这些发现建立了一条超越平衡态对称性约束的通往自旋反铁电性的非平衡路径，并通过自旋和极自由度的光学控制将Floquet工程、非常规磁性和多铁性联系起来。
英文摘要
Multiferroics combining magnetic and polar orders offer opportunities for optical control of spin and electric degrees of freedom. Here, using symmetry analysis and Floquet theory, we establish Floquet spin-antiferroelectricity coexisting with unconventional magnetism in periodically driven collinear antiferromagnets, qualifying it as an unconventional multiferroic. This driven phase supports compensated, spin-resolved in-plane electric polarizations perpendicular to the vertical rotation axis, which are strictly forbidden by crystalline symmetry in equilibrium. Using a tight-binding model, we elucidate how light polarization controls the emergence of polar order and spin responses. Moreover, first-principles-based Floquet calculations predict its realization in monolayer $\text{MnPS}_3$, identifying a realistic two-dimensional antiferromagnetic platform. These findings establish a nonequilibrium route to spin-antiferroelectricity beyond equilibrium symmetry constraints and connect Floquet engineering, unconventional magnetism, and multiferroicity through optical control of spin and polar degrees of freedom.
Comments21 pages, 11 figures
