Regensburg 2025 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 42: Superconductivity: Tunneling and Josephson Junctions

TT 42.6: Vortrag

Donnerstag, 20. März 2025, 10:45–11:00, H32

Gate-Controlled Superconductivity: Mechanisms, Parameters and Technological Potential — Leon Ruf, Jennifer Koch, Elke Scheer, and •Angelo Di Bernardo — University of Konstanz, Universitätsstraße 10, 78464 Konstanz

Over the past few years, several research groups have demonstrated the reversible control of the superconducting current flowing through a nanoscale-size constriction under the application of a gate voltage (V_G) - currently known as gate-controlled supercurrent (GCS) [1].

The numerous differences between fabrication protocols, device parameters and measurement setups adopted by these groups, however, have made it difficult to find universal features of the GCS effect.

In this talk, I will discuss the results of systematic studies carried by our group [2-4] that have allowed us to identify parameters that are key for the GCS observation and to achieve high reproducibility in the functioning of GCS devices [4]. In addition, I will review the progress that we have made towards the optimization of performance parameters that are important for the future development of technological applications based on the GCS.

[1] L. Ruf et al., Appl. Phys. Rev. 11, 041314 (2024).

[2] L. Ruf et al., APL Mater. 11, 091113 (2023).

[3] J. Koch et al., Nano Res. 17, 6575 (2024).

[4] L. Ruf et al., ACS Nano 18, 20600 (2024).

Keywords: Superconducting devices; Superconducting electronics; Gated devices