APL Materials (Sep 2023)

Effects of fabrication routes and material parameters on the control of superconducting currents by gate voltage

  • L. Ruf,
  • T. Elalaily,
  • C. Puglia,
  • Yu. P. Ivanov,
  • F. Joint,
  • M. Berke,
  • A. Iorio,
  • P. Makk,
  • G. De Simoni,
  • S. Gasparinetti,
  • G. Divitini,
  • S. Csonka,
  • F. Giazotto,
  • E. Scheer,
  • A. Di Bernardo

Journal volume & issue
Vol. 11, no. 9
pp. 091113 – 091113-7


Read online

The control of a superconducting current via the application of a gate voltage has been recently demonstrated in a variety of superconducting devices. Although the mechanism underlying this gate-controlled supercurrent (GCS) effect remains under debate, the GCS effect has raised great interest for the development of the superconducting equivalent of conventional metal-oxide semiconductor electronics. To date, however, the GCS effect has been mostly observed in superconducting devices made by additive patterning. Here, we show that devices made by subtractive patterning show a systematic absence of the GCS effect. Doing a microstructural analysis of these devices and comparing them to devices made by additive patterning, where we observe a GCS, we identify some material and physical parameters that are crucial for the observation of a GCS. We also show that some of the mechanisms proposed to explain the origin of the GCS effect are not universally relevant.