Enhancing speed limits to the Abrikosov vortex dynamics

这个项目的主要目的是通过实验探索和提高Abrikosov涡流在高直流电流密度和/或高交流频率下的超导薄膜中的动力学速度限制。采用适当的线性扩展周期性排列钉钉位置来有效地影响涡的运动。我们特别关注提高涡旋引导的电流上限和频率限制（涡旋沿着扩展的固定位置移动的趋势），棘轮（整流）效应及其逆转，即在高涡旋速度下运行的流体器件的关键效应。通过分析脉冲直流电驱动和高频交流刺激涡旋动力学的异同，我们将能够仔细研究薄膜超导体中工作的通量传输机制。

The main objective of this project is to experimentally probe and enhance the speed limits for the dynamics of Abrikosov vortices in superconducting films subjected to high dc current densities and/or high ac frequencies. A suitable arrangement of linearly-extended periodically arranged pinning sites is used to influence the vortex motion efficiently. We particularly focus on enhancing the upper current and frequency limits for vortex guiding (tendency of vortices to move along the extended pinning sites), the ratchet (rectifying) effect and its reversals, i. e the effects that are crucial for fluxonic devices operating at high vortex velocities. By analyzing similarities and differences between the pulsed-dc-driven and high-frequency-ac-stimulated vortex dynamics, we will be able to scrutinize flux transport mechanisms at work in thin-film superconductors.