共公度和非公度填充下周期基底上受驱动胶体粒子的动力学状态
Dynamic Regimes for Driven Colloidal Particles on a Periodic Substrate at Commensurate and Incommensurate Fillings
摘要：
我们研究胶体颗粒驱动周期性松饼锡基板使用数值模拟。在没有驱动力的情况下，该系统表现出丰富多样的相称和不相称的静态相，其中拓扑缺陷可以形成畴壁，有序条纹，超晶格和无序补丁制度作为填充分数的函数。当施加外部驱动时，这些不同的静态相位产生不同的动态响应。在无公度填充物处，流动通常以与拓扑缺陷结构的运动相关的局部脉冲或孤子的形式发生。我们还发现与速度力曲线的变化，拓扑缺陷安排的结构转变，以及速度分布和粒子轨迹的修改相关联的不同类型的移动状态之间的动态过渡。我们发现，有序和无序流动之间的动态转换表现出滞后，而在强无序制度没有滞后和速度力曲线是光滑的。当存在条纹图案时，可以沿着条纹方向而不是沿着驱动方向发生传输。结构动态转变也可以发生在钉扎制度时，所施加的驱动器导致扭曲的纵向钉扎的粒子，而钉扎网站捕获的粒子保持不动。
英文摘要：
We examine colloidal particles driven over a periodic muffin tin substrate using numerical simulations. In the absence of a driving force this system exhibits a rich variety of commensurate and incommensurate static phases in which topological defects can form domain walls, ordered stripes, superlattices, and disordered patchy regimes as a function of the filling fraction. When an external drive is applied, these different static phases generate distinct dynamical responses. At incommensurate fillings the flow generally occurs in the form of localized pulses or solitons correlated with the motion of the topological defect structures. We also find dynamic transitions between different types of moving states that are associated with changes in the velocity force curves, structural transitions in the topological defect arrangements, and modifications of the velocity distributions and particle trajectories. We find that the dynamic transitions between ordered and disordered flows exhibit hysteresis, while in strongly disordered regimes there is no hysteresis and the velocity force curves are smooth. When stripe patterns are present, transport can occur along the stripe direction rather than along the driving direction. Structural dynamic transitions can also occur within the pinned regimes when the applied drive causes distortions of the interstitially pinned particles while the particles trapped at pinning sites remain immobile.
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