自发运动在手性活性弹性环中产生可逆的非互易性
Spontaneous Motion Generates Reversible Nonreciprocity in an Achiral Active Elastic Ring
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- Center for Soft Condensed Matter Physics and Interdisciplinary Research & School of Physical Science and Technology, Soochow University（苏州大学物理科学与技术学院软凝聚态物理与交叉研究中心）
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中文总结 AI 辅助
该研究揭示自发旋转使无手性活性弹性环产生可逆的非互易机械响应，并阐明动力学状态选择非互易性、活性反馈控制临界放大的机制。
中文摘要 AI 辅助
非互易机械响应通常与内置的方向耦合、结构手性或外部驱动有关。一个无手性的活性体能否通过自身的运动产生并反转这种方向性，目前仍不清楚。在此，我们展示自发旋转使得具有互易被动相互作用的活性弹性环在机械上变得非互易。偏心弹性力重新定向推进，将形变耦合回运动。反转旋转会反转反对称响应，而补偿控制保持有限的方向性但强烈抑制近霍普夫共振。接近霍普夫时，所选响应随到失稳点的距离成反比增长，并在阈值之上成为自维持的传播形变。因此，非互易性由动力学状态选择，而活性反馈控制其临界放大。
英文摘要
Nonreciprocal mechanical response is usually associated with built-in directional couplings, structural chirality, or external driving. Whether an achiral active body can instead generate and reverse such directionality through its own motion remains less clear. Here we show that spontaneous rotation makes an active elastic ring with reciprocal passive interactions mechanically nonreciprocal. Off-center elastic forces reorient propulsion, coupling deformation back to motion. Reversing the rotation reverses the antisymmetric response, while a compensating control preserves finite directionality but strongly suppresses the near-Hopf resonance. Approaching Hopf, the selected response grows inversely with distance to onset and becomes a self-sustained traveling deformation above threshold. Thus nonreciprocity is selected by the dynamical state, while active feedback controls its critical amplification.
