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arXiv 2201.11180cond-mat.mes-hallcond-mat.supr-connlin.CD
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多端约瑟夫森结中多重态超电流的动力学稳定性

Dynamical Stabilization of Multiplet Supercurrents in Multi-terminal Josephson Junctions

Ethan G. Arnault, Sara Idris, Aeron McConnell, Lingfei Zhao, Trevyn F. Q. Larson, Kenji Watanabe, Takashi Taniguchi, Gleb Finkelstein, Francois Amet

摘要:

多终端约瑟夫森结的动力学特性最近引起了人们的兴趣,推动了新的见解的承诺合成拓扑相位的物质和Floquet状态。这一努力最终导致了库珀多重态的发现,其中库珀对的分裂是通过一系列的安德烈耶夫反射来实现的,这些反射会纠缠四个(或更多)电子。在本文中,我们最终表明,多重共振也可以出现作为三端电路模型的结果。超电流的出现是由于在对应于所施加偏压的多重态条件$nV_1 = -mV_2$的值处的相关相位动态。在i)纳米制造的三端石墨烯约瑟夫森结、ii)模拟三端约瑟夫森结电路和iii)电路模拟中看到多重态共振的出现。在这些条件下稳定系统状态的机制是纯动力学的,与Kapitza的倒立摆问题非常相似。我们描述了参数的考虑,最好的优化检测的多重线都为未来的设备的设计。此外,这些超电流具有经典鲁棒的$\cos2ϕ$能量贡献,其可用于基于更高次谐波设计量子位。

英文摘要:

The dynamical properties of multi-terminal Josephson junctions have recently 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. In this text, we show conclusively that multiplet resonances can also emerge as a consequence of the three terminal circuit model. The supercurrent appears due to the correlated phase dynamics at values that correspond to the multiplet condition $nV_1 = -mV_2$ of applied bias. The emergence of multiplet resonances is seen in i) a nanofabricated three-terminal graphene Josephson junction, ii) an analog three terminal Josephson junction circuit, and iii) a circuit simulation. The mechanism which stabilizes the state of the system under those conditions is purely dynamical, and a close analog to Kapitza's inverted pendulum problem. We describe parameter considerations that best optimize the detection of the multiplet lines both for design of future devices. Further, these supercurrents have a classically robust $\cos2ϕ$ energy contribution, which can be used to engineer qubits based on higher harmonics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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