Sergei Kozlov, Jérôme Lesueur, Dimitri Roditchev, Cheryl Feuillet-Palma
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引用次数: 0
摘要
电流偏压超导纳米桥中的电子传输是由内部无序景观中的量子涡旋运动决定的。在这里,我们从理论上考虑了单个或两个相邻线性缺陷穿过纳米桥的简单情况。在射频(RF)激励下,涡旋沿缺陷运动的强非谐性导致了分数夏皮罗阶跃。在有两个缺陷的情况下,涡旋运动变得相互关联,其特征是可被射频驱动锁定的可变状态。锁定-解锁过程会导致电压-电流特性的突然跳变和下降,这可以在实验中观察到。我们分析了促进这些瞬变动态状态的参数,并讨论了其可能的实验现实。涡旋运动决定了 II 型超导体的传输特性。在此,作者研究了涡旋与外部周期性驱动同步的效应,这种效应会导致整数和分数夏皮罗阶跃效应,甚至产生陨变态。
Dynamic metastable vortex states in interacting vortex lines
The electron transport in current-biased superconducting nano-bridges is determined by the motion of the quantum vortex confined in the internal disorder landscape. Here we consider theoretically a simple case of a single or two neighbouring linear defects crossing a nano-bridge. The strong anharmonicity of the vortex motion along the defect leads, upon radio frequency (RF) excitation, to fractional Shapiro steps. In the case of two defects, the vortex motion becomes correlated, characterised by metastable states that can be locked to the RF-drive. The lock-unlock process causes sudden voltage jumps and drops in the voltage-current characteristics that can be observed in experiments. We analyse the parameters that promote these metastable dynamic states and discuss their possible experimental realisations. Vortex motion defines transport properties of type II superconductors. Here, authors study the effect of vortex synchronisation with an external periodic drive, that leads to the effects of integer and fractional Shapiro steps and even creates metastable states.
期刊介绍:
Communications Physics is an open access journal from Nature Research publishing high-quality research, reviews and commentary in all areas of the physical sciences. Research papers published by the journal represent significant advances bringing new insight to a specialized area of research in physics. We also aim to provide a community forum for issues of importance to all physicists, regardless of sub-discipline.
The scope of the journal covers all areas of experimental, applied, fundamental, and interdisciplinary physical sciences. Primary research published in Communications Physics includes novel experimental results, new techniques or computational methods that may influence the work of others in the sub-discipline. We also consider submissions from adjacent research fields where the central advance of the study is of interest to physicists, for example material sciences, physical chemistry and technologies.