Homointerface planar Josephson junction based on inverse proximity effect

• URL: http://arxiv.org/abs/2112.02964v2
• Date: Sat, 2 Apr 2022 15:44:29 GMT
• Title: Homointerface planar Josephson junction based on inverse proximity effect
• Authors: Juewen Fan, Bingyan Jiang, Jiaji Zhao, Ran Bi, Jiadong Zhou, Zheng Liu, Ning Kang, Fanming Qu, Li Lu, Xiaosong Wu
• Abstract summary: We show a technique for fabricating planar Josephson junctions with perfect S/N interfaces. The technique utilizes a strong inverse proximity effect discovered in Al/V$_5$S$_8$ bilayers. Our JJ exhibits a giant critical current and a large product of the critical current and the normal state resistance.
• Score: 3.9250862740170183
• License: http://creativecommons.org/licenses/by/4.0/
• 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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