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.
Keywords
Cite
@article{arxiv.2012.15253,
title = {The Multi-terminal Inverse AC Josephson Effect},
author = {Ethan G. Arnault and Trevyn Larson and Andrew Seredinski and Lingfei Zhao and Sara Idris and Aeron McConnell and Kenji Watanabe and Takashi Taniguchi and Ivan V. Borzenets and Francois Amet and Gleb Finkelstein},
journal= {arXiv preprint arXiv:2012.15253},
year = {2021}
}
Comments
11 pages, 7 figures