We numerically examine vortices interacting with pinning arrays where a portion of the pinning sites have been removed in order to create coexisting regions of strong and weak pinning. The region without pinning sites acts as an easy-flow channel. For driving in different directions with respect to the channel, we observe distinct types of vortex flow. When the drive is parallel to the channel, the flow first occurs in the pin free region followed by a secondary depinning transition in the pinned region. At high vortex densities there is also an intermediate plastic flow phase due to the coupling between the weak and strong pinning regions. For driving applied perpendicular to the channel, we observe a jammed phase in which vortices accumulate on the boundary of the pinned region due to the vortex-vortex repulsion, while at higher drives the vortices begin to flow through the pinning array. For driving at an angle to the channel, depending on the filling we observe a drive-induced reentrant pinning effect as well as negative differential mobility which occurs when vortices move from the unpinned to the pinned portion of the sample.

中文翻译：

---

通道钉扎阵列中的涡流引导和传输

我们以数值方式检查与钉扎阵列相互作用的涡旋，其中一部分钉扎位点已被移除，以创建强钉扎和弱钉扎的共存区域。没有钉扎位点的区域充当易流通道。对于相对于通道在不同方向上行驶，我们观察到不同类型的涡流。当驱动器平行于通道时，流动首先发生在无销区域，然后在有销区域发生二次脱销过渡。在高涡流密度下，由于弱钉扎区和强钉扎区之间的耦合，还存在中间塑性流动阶段。对于垂直于通道应用的驱动，我们观察到一个阻塞阶段，其中由于涡旋 - 涡旋排斥，涡流在固定区域的边界上积聚，而在更高的驱动下，涡流开始流过钉扎阵列。对于与通道成一定角度的驱动，我们观察到驱动诱导的重入钉扎效应以及当涡流从样品的未钉扎部分移动到钉扎部分时发生的负差分迁移率。