非均匀钉扎阵列中超导体的涡旋剪切带转变
Vortex Shear Banding Transitions in Superconductors with Inhomogeneous Pinning Arrays
AI总结：
本研究通过数值模拟发现，在含移除钉扎带的方形阵列中，涡旋脱钉始于无钉扎通道并形成准一维剪切带，其连续脱钉导致速度台阶，垂直驱动下可产生场效应晶体管现象。
摘要：
我们数值研究了包含方形钉扎阵列的样品中涡旋的流动，其中移除了一条钉扎带。当施加的驱动相对于带方向成一定角度时，我们发现涡旋脱钉始于无钉扎通道内。移动的涡旋形成一系列准一维剪切带，这些剪切带开始在无钉扎通道内部流动，且运动逐渐接近钉扎区域的边缘。每个剪切带的连续脱钉表现为速度-力曲线中的一系列跳跃以及空间速度分布中的尖锐台阶。当沿平行于无钉扎通道方向施加恒定驱动，同时垂直方向驱动逐渐增加时，净涡旋速度以一系列台阶形式下降，这些台阶对应于涡旋带的固定化，在某些情况下流动可降至零，从而产生场效应晶体管现象。这些结果也应适用于其他在非均匀钉扎存在下表现出脱钉行为的系统类型。
英文摘要：
We numerically examine the flow of superconducting vortices in samples containing square pinning arrays in which a band of pins is removed. When a drive is applied at an angle with respect to the band orientation, we find that the vortex depinning initiates in the pin-free channel. The moving vortices form a series of quasi-one-dimensional shear bands that begin flowing in the bulk of the pin-free channel, and the motion gradually approaches the edge of the pinned region. The consecutive depinning of each shear band appears as a series of jumps in the velocity-force curves and as sharp steps in the spatial velocity profiles. When a constant drive is applied parallel to the pin-free channel along with a gradually increasing perpendicular drive, the net vortex velocity decreases in a series of steps that correspond to the immobilization of bands of vortices, and in some cases the flow can drop to zero, creating a field effect transistor phenomenon. These results should also be relevant to other types of systems that exhibit depinning in the presence of inhomogeneous pinning.
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