Homointerface planar Josephson junction based on inverse proximity effect

  1. Juewen Fan,
  2. Bingyan Jiang,
  3. Jiaji Zhao,
  4. Ran Bi,
  5. Jiadong Zhou,
  6. Zheng Liu,
  7. Ning Kang,
  8. Fanming Qu,
  9. Li Lu,
  10. and Xiaosong Wu
The quality of a superconductor-normal metal-superconductor (SNS) 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 interfaces. The technique utilizes a strong inverse proximity effect (IPE) discovered in Al/V5S8 bilayers, by which Al is driven into the normal state. The highly transparent homointerface enables 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. The latter exceeds the theoretical bound, which is probably related to the unusual normal metal weak link.
arxiv pdf

leave comment