The Multi-terminal Inverse AC Josephson Effect

Abstract

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 multi-terminal 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 multi-terminal Josephson junctions are a playground to study highly-connected nonlinear networks with novel topologies.

arXiv comment11 pages, 7 figures

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Cited by in corpus (8)

• Gate-tunable Superconducting Diode Effect in a Three-terminal Josephson Device
• Selective Control of Conductance Modes in Multi-terminal Josephson Junctions
• Multi-terminal Josephson junctions: a road to topological flux networks
• Non-Abelian monopoles in the multiterminal Josephson effect
• A quantum interferometer for quartets in superconducting three-terminal Josephson junctions
• Probing the topological band structure of diffusive multiterminal Josephson junction devices with conductance measurements
• Majorana Braiding Racetracks from Charge Chern Insulator - Superconductor Hybrids
• Dynamical Stabilization of Multiplet Supercurrents in Multi-terminal Josephson Junctions