Dynamical Stabilization of Multiplet Supercurrents in Multiterminal Josephson Junctions
Dynamical Stabilization of Multiplet Supercurrents in Multiterminal Josephson Junctions
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DOI：
10.1021/acs.nanolett.2c01999
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发表时间：
2022-08-23
期刊：
影响因子：
10.8
通讯作者：
Amet, Francois
中科院分区：
文献类型：
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作者：
Arnault, Ethan G.;Idris, Sara;Amet, Francois
多端约瑟夫森结 (MT-JJ) 的动力学特性引起了人们的兴趣，这得益于对物质的合成拓扑相和 Floquet 态的新见解。这项努力最终发现了库珀多重态，其中库珀对的分裂是通过一系列纠缠四个（或更多）电子的安德烈夫反射实现的。在这里，我们表明多重共振也可以作为三端电路模型的结果而出现。超电流的出现是由于相关相位动力学的值对应于施加偏压的多重态条件 nV(1) = -mV(2)。在纳米制造的三端石墨烯 JJ、模拟三端 JJ 电路和电路模拟中可以看到多重共振。超电流的稳定是纯粹动态的，与卡皮查的倒立摆问题非常相似。我们描述了优化多重线检测的参数考虑因素，以用于未来设备的设计。
The dynamical properties of multiterminal Josephson junctions (MT-JJs) have attracted interest, driven by the promise of new insights into synthetic topological phases of matter and Floquet states. This effort has culminated in the discovery of Cooper multiplets in which the splitting of a Cooper pair is enabled via a series of Andreev reflections that entangle four (or more) electrons. Here, we show that multiplet resonances can also emerge as a consequence of the three-terminal circuit model. The supercurrent appears due to correlated phase dynamics at values that correspond to the multiplet condition nV(1) = -mV(2) of applied bias. Multiplet resonances are seen in nanofabricated three terminal graphene JJs, analog three-terminal JJ circuits, and circuit simulations. The stabilization of the supercurrent is purely dynamical, and a close analog to Kapitza's inverted pendulum problem. We describe parameter considerations that optimize the detection of the multiplet lines both for design of future devices.