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arXiv · 2112.02964

Homointerface planar Josephson junction based on inverse proximity effect

Juewen Fan·Bingyan Jiang·Jiaji Zhao·Ran Bi·Jiadong Zhou·Zheng Liu·Ning Kang·Fanming Qu·Li Lu·Xiaosong Wu
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Abstract

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/V$_5$S$_8$ 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 $\mu$m long weak link. Moreover, our JJ exhibits a giant critical current and a large product of the critical current and the normal state resistance.

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Juewen Fan, Bingyan Jiang, Jiaji Zhao, Ran Bi, Jiadong Zhou, Zheng Liu, Ning Kang, Fanming Qu, Li Lu, Xiaosong Wu. 2021-12-06. Homointerface planar Josephson junction based on inverse proximity effect. https://doi.org/10.1063/5.0076861

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