论文标题
定期基板上胶体单层的集体定向锁定
Collective Directional Locking of Colloidal Monolayers on a Periodic Substrate
论文作者
论文摘要
我们研究了当磁性气泡的三角形晶格驱动磁磁性胶体颗粒的单层时会产生的定向锁定效应。我们使用外部旋转磁场生成二维行驶波棘轮，迫使粒子沿着与晶格的两个晶体学轴相交的方向的传输。我们发现，尽管单个颗粒没有首选方向，但集体效应通过自发的对称性破裂引起横向电流和高密度方向锁定。胶体电流可以通过额外的偏置场极化，该偏置场使一个传输方向能量优先。
We investigate the directional locking effects that arise when a monolayer of paramagnetic colloidal particles is driven across a triangular lattice of magnetic bubbles. We use an external rotating magnetic field to generate a two dimensional traveling wave ratchet forcing the transport of particles along a direction that intersects two crystallographic axes of the lattice. We find that, while single particles show no preferred direction, collective effects induce transversal current and directional locking at high density via a spontaneous symmetry breaking. The colloidal current may be polarized via an additional bias field that makes one transport direction energetically preferred.
