Multiple reversals of vortex ratchet effects in a superconducting strip with inclined dynamic pinning landscape
Multiple reversals of vortex ratchet effects in a superconducting strip with inclined dynamic pinning landscape
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DOI：
10.1088/1674-1056/abbbe5
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发表时间：
2020-12
影响因子：
1.7
通讯作者：
A. He;C. Xue
中科院分区：
文献类型：
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作者：
A. He;C. Xue
利用含时的Ginzburg-Landau方法，研究了在倾斜的动态钉扎势作用下，无图案超导带材中棘轮效应的多次反转。在共线滑动势和洛仑兹力的情况下，涡总是被限制在滑动势诱导的通道中。然而，由于滑动钉扎势相对于洛伦兹力的倾斜角，涡旋可以被驱动出通道，并且观察到与涡旋整流的多次反转的意想不到的结果。通过分析不同的涡流运动方案，随着交流电流幅值的增加，探讨了涡流整流的多次逆转机制。横向和纵向棘齿效应的多次反转可由交流振幅和动态钉扎速度高度控制。在一定的大电流下，棘轮效应在较大的钉扎滑动速度范围内达到最强。
Using time-dependent Ginzburg–Landau formalism, we investigate the multiple reversals of ratchet effects in an unpatterned superconducting strip by the tilted dynamic pinning potential. In the case of collinear sliding potential and Lorentz force, vortices are always confined in the channels induced by sliding potential. However, due to the inclination angle of sliding pinning potential with respect to the Lorentz force, vortices could be driven out of the channels, and unexpected results with multiple reversals of vortex rectifications are observed. The mechanism of multiple reversals of vortex rectifications is explored by analyzing different vortex motion scenarios with increasing ac current amplitudes. The multiple reversals of transverse and longitudinal ratchet effects can be highly controlled by ac amplitude and dynamic pinning velocity. What's more, at certain large current the ratchet effect reaches strongest within a wide range of pinning sliding velocity.