The quality of a superconductor-normal metal-superconductor Josephson junction (JJ) depends crucially on the transparency of the superconductor-normal metal (S/N) interface. We demonstrate a technique for fabricating planar JJs with perfect S/N interfaces. The technique utilizes a strong inverse proximity effect discovered in Al/V5S8 bilayers, by which the Al layer is driven into the resistive state. The highly transparent S/N homointerface and the peculiar normal metal enable the flow of Josephson supercurrent across a 2.9 μm long weak link. Moreover, our JJ exhibits a giant critical current and a large product of the critical current and the normal state resistance.
@article{arxiv.2112.02964,
title = {Homointerface planar Josephson junction based on inverse proximity effect},
author = {Juewen Fan and Bingyan Jiang and Jiaji Zhao and Ran Bi and Jiadong Zhou and Zheng Liu and Ning Kang and Fanming Qu and Li Lu and Xiaosong Wu},
journal= {arXiv preprint arXiv:2112.02964},
year = {2022}
}