Self-attraction into spinning eigenstates of a mobile wave source by its emission back-reaction.
Self-attraction into spinning eigenstates of a mobile wave source by its emission back-reaction.
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通过其发射反反应，自吸引进入移动波源的旋转本征态。
DOI：
10.1103/physreve.94.042224
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
E. Fort
中科院分区：
文献类型：
--
作者：
M. Labousse;S. Perrard;Y. Couder;E. Fort
辐射波在发射源上的后向反应是一个普遍的问题。在最一般的情况下，对运动波源的反向反应取决于它们的整个历史。在这里，我们研究了一个模型系统，在该模型系统中，点源由其自身记忆赋予的波场来引导。这种情况是通过实验实现的，使用的是一个在垂直振动的液浴上反弹的自推进液滴，并由它沿其轨迹产生的波驱动。液滴及其相关的波场形成了一个具有内在双重粒子波特性的实体。波场在其干涉结构中编码了液滴过去的轨迹。在这篇文章中，我们证明了这种物体可以自组织成一种旋转状态，在这种状态下，液滴在没有任何外部相互作用的情况下具有轨道运动。旋转是由波介导的液滴与其自身过去的吸引人的相互作用驱动的。从实验、数值和理论上对由此产生的“记忆力”进行了研究和表征。曲率半径接近半个波长的轨道被证明是记忆诱导的液滴运动的动力学吸引子。
The back-reaction of a radiated wave on the emitting source is a general problem. In the most general case, back-reaction on moving wave sources depends on their whole history. Here we study a model system in which a pointlike source is piloted by its own memory-endowed wave field. Such a situation is implemented experimentally using a self-propelled droplet bouncing on a vertically vibrated liquid bath and driven by the waves it generates along its trajectory. The droplet and its associated wave field form an entity having an intrinsic dual particle-wave character. The wave field encodes in its interference structure the past trajectory of the droplet. In the present article we show that this object can self-organize into a spinning state in which the droplet possesses an orbiting motion without any external interaction. The rotation is driven by the wave-mediated attractive interaction of the droplet with its own past. The resulting "memory force" is investigated and characterized experimentally, numerically, and theoretically. Orbiting with a radius of curvature close to half a wavelength is shown to be a memory-induced dynamical attractor for the droplet's motion.