Multiterminal Inverse AC Josephson Effect
Multiterminal Inverse AC Josephson Effect
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DOI：
10.1021/acs.nanolett.1c03474
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发表时间：
2021-11-24
期刊：
影响因子：
10.8
通讯作者：
Finkelstein, Gleb
中科院分区：
文献类型：
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作者：
Arnault, Ethan G.;Larson, Trevyn F. Q.;Finkelstein, Gleb
当约瑟夫森结暴露于微波辐射时，它会发生逆交流约瑟夫森效应，结的相位锁定在驱动频率上。结果，结的I-V曲线获得了量化电压的“Shapiro台阶”。如果结具有三个或更多个超导接触，则必须考虑不同端子对之间的耦合，并且结的状态在更高维的相空间中演化。在这里，我们研究了具有三个超导终端的石墨烯样品中的多端逆交流约瑟夫森效应。我们观察到强大的分数夏皮罗步骤和相关的开关事件，这只能通过考虑作为一个完全连接的约瑟夫森网络的设备来解释。我们成功地模拟所观察到的行为，使用修改后的二维RCSJ模型。我们的研究结果表明，多端约瑟夫森结是一个游乐场，研究高度连接的非线性网络与新的拓扑结构。
When a Josephson junction is exposed to microwave radiation, it undergoes the inverse AC Josephson effect.the phase of the junction locks to the drive frequency. As a result, the I-V curves of the junction acquire "Shapiro steps" of quantized voltage. If the junction has three or more superconducting contacts, coupling between different pairs of terminals must be taken into account and the state of the junction evolves in a phase space of higher dimensionality. Here, we study the multiterminal inverse AC Josephson effect in a graphene sample with three superconducting terminals. We observe robust fractional Shapiro steps and correlated switching events, which can only be explained by considering the device as a completely connected Josephson network. We successfully simulate the observed behaviors using a modified two-dimensional RCSJ model. Our results suggest that multiterminal Josephson junctions are a playground to study highly connected nonlinear networks with novel topologies.