用磁子诱导声子拓扑相，实现可调的声子陈数
Magnon-induced phononic Chern insulator
- 磁子与声子耦合打破时间反演对称性，开启全陈隙
- 可实现|C|=1和|C|=2的拓扑相，间隙超过损耗
- 适用于吉赫兹级片上集成声学器件，磁控可调
高频人工声子晶体提供低损耗、兼容片上集成的平台，但在吉赫兹频率实现陈声子相仍具挑战。本文提出在六角形中心嵌入铁磁岛的蜂窝声子晶体中，通过圆偏振的Kittel模与周围声子耦合产生相位缠绕，破坏时间反演对称性并打开全陈隙。在大失谐条件下，该机制等效于具有磁子诱导复跃迁的哈达玛型声子模型。通过调节磁子-声子相互作用，整个混合系统可实现拓扑陈数|C|=1和|C|=2的相。预测的能隙可超过实际声子和磁子线宽，可在吉赫兹声学器件中观测。本工作确立了手性磁子-声子杂化作为磁可重构拓扑声学的新路径。
原文摘要 · Abstract (English)
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.
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