磁振子诱导的声子陈绝缘体
Magnon-induced phononic Chern insulator
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中文总结 AI 辅助
本文提出一种磁振子诱导的声子陈绝缘体，通过蜂窝状声子晶体与铁磁岛杂化，利用磁振子-声子耦合打开陈能隙，可实现可调陈数，为磁可重构拓扑声子学提供新途径。
中文摘要 AI 辅助
高频人工声子晶体提供了与片上集成兼容的低损耗平台，但在GHz频率下实现陈声子相仍具挑战性。本文提出一种磁振子诱导的声子陈绝缘体，该结构基于蜂窝状声子晶体，在其六边形中心杂化有铁磁岛。圆极化的Kittel模式以相位缠绕的方式与周围声子耦合，这一过程破坏了时间反演对称性并打开了完整的陈能隙。在大失谐 regime 中，该机制形成了具有磁振子诱导复 hopping 的有效Haldane型声子模型。通过调节磁振子-声子相互作用，整个杂化系统可获得可调陈数|C|=1和|C|=2的陈相。预测的能隙可超过实际声子和磁振子的线宽，使其能在GHz声学器件中被观测到。本研究确立了手性磁振子-声子杂化为磁可重构拓扑声子学的一条途径。
英文摘要
High-frequency artificial phononic crystals offer a low-loss platform compatible with on-chip integration, yet realizing Chern phononic phases at GHz frequencies remains challenging. Here, we propose a magnon-induced phononic Chern insulator in a honeycomb phononic crystal hybridized with ferromagnetic islands at the hexagon centers. A circularly polarized Kittel mode couples to the surrounding phonons with a phase winding, which breaks time-reversal symmetry and opens a full Chern gap. In the large-detuning regime, this mechanism leads to an effective Haldane-type phononic model with magnon-induced complex hopping. By tuning the magnon-phonon interaction, the full hybrid system accesses Chern phases with tunable Chern numbers |C|=1 and |C|=2. The predicted gaps can exceed realistic phonon and magnon linewidths, enabling their observation in GHz acoustic devices. Our work establishes chiral magnon--phonon hybridization as a route to magnetically reconfigurable topological phononics.
发表机构
- The Chinese University of Hong Kong（香港中文大学）
- Zhejiang University（浙江大学）
机构由 AI 辅助整理，请以论文原文为准。
