几何相位与非互易自旋波圆偏振器
Geometric phase and a nonreciprocal spin wave circular polarizer
AI总结：
本文研究反铁磁体中自旋波沿非共面磁化循环轨迹获得的偏振依赖几何相位，提出并验证了由循环90度畴壁构成的马赫-曾德尔干涉仪可作为具有内禀非互易性的自旋波圆偏振器。
摘要：
我们证明，在反铁磁体中，自旋波沿非共面磁化的循环轨迹会获得一个依赖于偏振的几何相位。具体而言，我们证明一组循环的90度反铁磁畴壁会同时向自旋波引入几何相位和动力学相位，从而导致左旋/右旋分量的总相位幅度不对称。基于这种依赖于偏振的相位，我们从理论上提出并通过微磁学模拟证实：一个马赫-曾德尔干涉仪，其一臂包含循环90度畴壁，另一臂为均匀畴，自然充当自旋波圆偏振器。此外，该圆偏振器具有内禀非互易性，在相反的传播方向上过滤相反的偏振。
英文摘要：
We show that spin wave acquires a polarization-dependent geometric phase along a cyclic trajectory of non-coplanar magnetizations in antiferromagnets. Specifically, we demonstrate that a cyclic set of 90 degree antiferromagnetic domain walls simultaneously introduce geometric and dynamic phases to spin wave, and thus leads to asymmetric magnitude of overall phase for left-/right-circular components. Based on the polarization-dependent phase, we propose theoretically and confirm by micromagnetic simulations that, a Mach-Zehner interferometer with cyclic 90 degree domain walls in one arm and homogenous domain in the other arm, naturally acts as a spin wave circular polarizer. Moreover, the circular polarizer has intrinsic nonreciprocity, which filters opposite polarization in opposite propagation direction.
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