AI 中文总结
该研究建立FMI-SC异质结构的自旋波光学理论，利用超导迈斯纳屏蔽实现负折射等非常规波动现象，可制备温度可调的自旋波器件，为磁子器件提供通用平台。
AI 中文摘要
我们研究铁磁绝缘体-超导体（FMI-SC）异质结构中的自旋波输运，并为这些混合系统中的自旋波光学建立了通用理论框架。我们证明，超导体的迈斯纳屏蔽会引发一系列非常规波动现象，包括负相速度与负群速度折射，以及与光学对应物存在根本差异的反射和折射定律。在该框架内，我们推导了描述FMI-SC界面反射与透射的自旋波菲涅耳方程，表明散射特性具有显著的温度依赖性，可实现可调谐自旋波反射镜与折射元件。最引人注目的是，我们发现超导屏蔽能产生近乎平直的等频率轮廓，其平直度远超常规偶极自旋波系统中可获得的带拐点的固有弯曲轮廓。我们证明，这些平直轮廓可实现完美自旋波成像、高效波导以及移相器、分束器等干涉元件等功能，具备非常规特性。我们的结果确立了FMI-SC异质结构作为温度可调自旋波光学与干涉式磁子器件的通用平台。
英文摘要
We investigate spin-wave transport in ferromagnetic insulator-superconductor (FMI-SC) heterostructures and develop a general theoretical framework for spin-wave optics in these hybrid systems. We demonstrate that Meissner screening by the superconductor gives rise to a range of unconventional wave phenomena, including negative phase- and group-velocity refraction, and reflection and refraction laws that differ fundamentally from their optical counterparts. Within this framework, we derive the spin-wave Fresnel equations governing reflection and transmission at FMI-SC interfaces and show that the scattering properties exhibit a pronounced temperature dependence, enabling tunable spin-wave mirrors and refractive elements. Most strikingly, we find that superconducting screening can produce nearly straight isofrequency contours, far flatter than the kinked, intrinsically curved contours attainable in conventional dipolar spin-wave systems. We show that these straight contours enable functionalities such as perfect spin-wave imaging, efficient waveguiding, and interferometric elements, such as phase shifters and beam splitters, with unconventional properties. Our results establish FMI-SC heterostructures as a versatile platform for temperature-tunable spin-wave optics and interferometric magnonic devices.
Comments31 pages, 10 figures
