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Stroboscopic phenomena in superconductors with dynamic pinning landscape

机译:具有动态固定景观的超导体中的频闪现象

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摘要

Introducing artificial pinning centers is a well established strategy to trap quantum vortices and increase the maximal magnetic field and applied electric current that a superconductor can sustain without dissipation. In case of spatially periodic pinning, a clear enhancement of the superconducting critical current arises when commensurability between the vortex configurations and the pinning landscape occurs. With recent achievements in (ultrafast) optics and nanoengineered plasmonics it has become possible to exploit the interaction of light with superconductivity, and create not only spatially periodic imprints on the superconducting condensate, but also temporally periodic ones. Here we show that in the latter case, temporal matching phenomena develop, caused by stroboscopic commensurability between the characteristic frequency of the vortex motion under applied current and the frequency of the dynamic pinning. The matching resonances persist in a broad parameter space, including magnetic field, driving current, or material purity, giving rise to unusual features such as externally variable resistance/impedance and Shapiro steps in current-voltage characteristics. All features are tunable by the frequency of the dynamic pinning landscape. These findings open further exploration avenues for using flashing, spatially engineered, and/or mobile excitations on superconductors, permitting us to achieve advanced functionalities.
机译:引入人工钉扎中心是一种成熟的策略,可以捕获量子涡旋并增加超导体可以维持而不耗散的最大磁场和施加的电流。在空间周期性钉扎的情况下,当涡旋构型与钉扎景观之间出现可比性时,就会明显增强超导临界电流。随着在(超快)光学和纳米工程等离子技术方面的最新成就,利用光与超导性的相互作用成为可能,不仅在超导冷凝物上在空间上有周期性的印记,而且在时间上也有周期性的印记。在这里,我们表明,在后一种情况下,由于频闪观测在施加电流下的涡旋运动的特征频率与动态钉扎的频率之间存在频闪可比性,因此会出现时间匹配现象。匹配的谐振会在广阔的参数空间(包括磁场,驱动电流或材料纯度)中持续存在,从而产生异常的特征,例如外部可变电阻/阻抗和电流-电压特性的Shapiro阶跃。所有功能均可通过动态钉扎情况的频率进行调整。这些发现为在超导体上使用闪烁,空间工程和/或移动激发开辟了更多的探索途径,从而使我们能够实现先进的功能。

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