通过动态环绕奇异点实现弹性自旋的手性切换
Chiral switching of elastic spin via dynamic encirclement of exceptional points
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中文总结 AI 辅助
研究在非厄米微极超材料中，通过动态环绕具有非平凡拓扑的奇异点，实现弹性自旋的手性切换，为弹性自旋选择性操纵建立途径，推动非厄米自旋声子学等应用发展。
中文摘要 AI 辅助
在经典波系统中，动态环绕奇异点（EPs）可实现手性状态转换。但此机制能否扩展到手性自旋转换仍不清楚。本文展示了在非厄米微极（Cosserat）超材料中通过动态环绕EPs实现弹性自旋的手性切换。微极手性与各向异性损耗的相互作用产生具有非平凡黎曼曲面拓扑的EPs。环绕这些EPs可转换弹性自旋，最终自旋符号仅由环绕轨迹的手性决定。结果为弹性自旋的选择性操纵建立了基本途径，为非厄米自旋声子学及其他波系统的更广泛应用开辟了道路。
英文摘要
Dynamically encircling exceptional points (EPs) enables chiral state conversion in classical wave systems. However, whether this mechanism can be extended to chiral spin conversion has remained elusive. Here we demonstrate chiral switching of elastic spin via dynamic encirclement of EPs in a non-Hermitian micropolar (Cosserat) metamaterial. The interplay between micropolar chirality and anisotropic loss generates EPs with a nontrivial Riemann-sheet topology. Encircling these EPs converts the elastic spin, with the final spin sign dictated solely by the handedness of the encircling trajectory. Our results establish a fundamental route for the selective manipulation of elastic spin, opening avenues for non-Hermitian spin phononics and broader applications in other wave systems.
