斯格明子弹球与障碍物阵列上的定向运动
Skyrmion Pinball and Directed Motion on Obstacle Arrays
AI总结：
本研究通过交流驱动下斯格明子与障碍物阵列的相互作用，揭示了马格努斯力导致的轨道变化及定向运动，为受控斯格明子输运提供了新机制。
摘要：
我们研究了在交流驱动下（沿一个或两个方向施加）斯格明子与方形障碍物阵列的相互作用。对于单一方向的交流驱动，我们发现马格努斯力与障碍物相互作用相结合，可以产生尺寸不断增大的椭圆斯格明子轨道，从而导致局域相、混沌相以及平移或棘轮轨道。在沿两个方向施加且相位差为90°的双交流驱动下，斯格明子形成局域共度轨道，这些轨道环绕整数个障碍物，类似于在反点晶格中观察到的电子弹球效应。作为交流振幅、马格努斯力强度和障碍物尺寸的函数，我们发现即使在基底不对称性缺失的情况下，混沌散射区域和定向运动也可能出现。定向运动沿周期性基底的不同对称轴进行，我们观察到多种反向棘轮效应。斯格明子系统中的马格努斯力产生的定向运动区域数量显著多于过阻尼系统。我们讨论了如何利用这些结果以受控方式移动斯格明子，以用于潜在的应用。
英文摘要：
We examine skyrmions interacting with a square array of obstacles under ac drives applied in one or two directions. For a single direction of ac driving, we find that the Magnus force in conjunction with the obstacle interactions can create elliptical skyrmion orbits of increasing size, leading to localized phases, chaotic phases, and translating or ratcheting orbits. Under two ac drives that are out of phase by $90^\circ$ and applied in two directions, the skyrmions form localized commensurate orbits that encircle an integer number of obstacles, similar to the electron pinball effect observed for electrons in antidot lattices. As a function of ac amplitude, Magnus force strength, and obstacle size, we find that chaotic scattering regimes and directed motion can emerge even in the absence of asymmetry in the substrate. The directed motion follows different symmetry axes of the periodic substrate, and we observe a variety of reversed ratchet effects. The Magnus force in the skyrmion system produces a significantly larger number of directed motion regimes than are exhibited by overdamped systems. We discuss how these results could be used to move skyrmions in a controlled way for possible applications.
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