发表机构
State Key Laboratory of Surface Physics and Institute for Nanoelectronic Devices and Quantum Computing, Fudan University; Department of Physics, Fudan University; Zhangjiang Fudan International Innovation Center, Fudan University（复旦大学表面物理国家重点实验室和纳米电子器件与量子计算研究所; 复旦大学物理系; 复旦大学张江国际创新中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文提出利用磁系统中固有的几何非线性，通过横向Floquet工程实现低阈值磁子频率梳的产生，为增强MFC性能提供新理论。
AI 中文摘要
通过内部磁非线性产生的磁子频率梳（MFCs）已展现出超越其光学对应物的丰富物理现象。然而，现有方法依赖于动态非线性，这通常需要高功率阈值和严格的动量守恒。这里我们表明，磁系统中固有的几何非线性，源于磁化矢量单位范数约束，可以作为MFC产生的独立非线性资源。通过横向Floquet工程，这种几何约束将横向驱动转换为纵向参数调制。在低频极限下，四粒子过程简化为有效的双磁子调制，从而在线性区域实现低阈值梳的产生，其中调制幅度随驱动场二次方缩放，并且由几何谐波引起的平坦度增强。这些结果提供了对频率梳和磁子非线性相互作用的更深入理解，并为增强MFC性能提供了新的理论基础。
英文摘要
Magnonic frequency combs (MFCs) generated via internal magnetic nonlinearities have exhibited rich physics beyond their optical counterparts. However, existing approaches rely on dynamic nonlinearity, which typically demands high power thresholds and stringent momentum conservation. Here we show that the geometric nonlinearity intrinsic to magnetic systems, originating from the unit-norm constraint of the magnetization vector, can serve as an independent nonlinear resource for MFC generation. Through transverse Floquet engineering, this geometric constraint converts a transverse drive into a longitudinal parametric modulation. In the low-frequency limit, the four-particle process reduces to an effective two-magnon modulation, enabling low-threshold comb generation in the linear regime, with the modulation amplitude scaling quadratically with the driving field and enhanced flatness arising from geometric harmonics. These results provide a deeper understanding of frequency combs and magnon nonlinear interactions, and offer a new theoretical foundation for enhancing MFC performance.
Comments17 pages, 7 figures
