标题： 自推进活性向列相 显示英文标题

标题： Self-propulsive active nematics

摘要： 越来越多的证据表明，活性物质表现出混合对称性的实例，这些实例无法仅通过极性或向列态的形式主义来完全描述。 在这里，我们引入了一个最小模型，将自推进整合到活性向列框架中。 我们的线性稳定性分析揭示了自推进如何改变不稳定性开始的条件，从根本上改变了动力学景观。 数值模拟验证了这些预测，显示自推进引发了反超均匀涨落、涡度中的异常长程有序以及非普遍的自相似能量级联。 值得注意的是，这些长程有序态在进入 flocking 状态的转变之前，就出现在活性湍流区域中。 此外，我们的分析强调了自组织与自推进之间的非单调依赖关系，最优状态由相关长度的峰值特征化。 这些发现对于理解自推进的活性向列系统，如迁移细胞层或群体细菌具有重要意义，并为设计具有定制集体行为的合成系统提供了新途径，弥合了活性向列系统与自推进系统之间的差距。 显示英文摘要

摘要： Increasing evidence suggests that active matter exhibits instances of mixed symmetry that cannot be fully described by either polar or nematic formalism. Here, we introduce a minimal model that integrates self-propulsion into the active nematic framework. Our linear stability analyses reveal how self-propulsion shifts the onset of instability, fundamentally altering the dynamical landscape. Numerical simulations confirm these predictions, showing that self-propulsion induces anti-hyperuniform fluctuations, anomalous long-range order in vorticity, and non-universal self-similar energy cascades. Notably, these long-range ordered states emerge within the active turbulence regime well before the transition to a flocking state. Additionally, our analyses highlight a non-monotonic dependence of self-organization on self-propulsion, with optimal states characterized by a peak in correlation length. These findings are relevant for understanding of active nematic systems that self-propel, such as migrating cell layers or swarming bacteria, and offer new avenues for designing synthetic systems with tailored collective behaviours, bridging the gap between active nematics and self-propulsive systems.