超导棘轮中的涡核变形和步进电机行为
Vortex core deformation and stepper motor behavior in a superconducting ratchet
摘要：
我们通过电输运测量实验研究了超导涡旋棘齿效应的频率依赖性，并使用时间相关的Ginzburg-Landau形式主义理论建模。我们证明了高频涡旋行为可以描述为粒子在周期势中的离散运动，即所谓的步进电机行为。引人注目的是，在更常规的低频响应中，发生从Abrikosov涡流整流器到相位滑移线整流器的过渡。这种转变的特征在于整流电压的大幅增加和明显滞后行为的出现。
英文摘要：
We investigated experimentally the frequency dependence of a superconducting vortex ratchet effect by means of electrical transport measurements and modeled it theoretically using the time dependent Ginzburg-Landau formalism. We demonstrate that the high frequency vortex behavior can be described as a discrete motion of a particle in a periodic potential, i.e. the so called stepper motor behavior. Strikingly, in the more conventional low frequency response a transition takes place from an Abrikosov vortex rectifier to a phase slip line rectifier. This transition is characterized by a strong increase in the rectified voltage and the appearance of a pronounced hysteretic behavior.
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