Experimental Observation of Directional Locking and Dynamical Ordering of Colloidal Monolayers Driven across Quasiperiodic Substrates
Experimental Observation of Directional Locking and Dynamical Ordering of Colloidal Monolayers Driven across Quasiperiodic Substrates
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DOI：
10.1103/physrevlett.109.058301
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发表时间：
2012-07-31
影响因子：
8.6
通讯作者：
Bechinger, Clemens
中科院分区：
文献类型：
--
作者：
Bohlein, Thomas;Bechinger, Clemens
我们实验研究了相互作用的胶体单分子层的结构行为，该胶体单分子层被驱动穿过由光学干涉图案产生的十次准周期势景观。当驱动力的方向变化时，我们观察到单层被定向锁定在对应于底层电势的对称轴的角度上。在这样的锁定步骤，我们观察到一个动态有序的近晶相与最近的模拟。我们证明，这种动态排序是由于粒子通道形成的间隙和非间隙粒子的相互作用。
We experimentally investigate the structural behavior of an interacting colloidal monolayer being driven across a decagonal quasiperiodic potential landscape created by an optical interference pattern. When the direction of the driving force is varied, we observe the monolayer to be directionally locked on angles corresponding to the symmetry axes of the underlying potential. At such locking steps, we observe a dynamically ordered smectic phase in agreement with recent simulations. We demonstrate that such dynamical ordering is due to the interaction of particle lanes formed by interstitial and noninterstitial particles.