Gate-controlled Supercurrent Effect in Dry-etched Dayem Bridges of Non-centrosymmetric Niobium Rhenium

Authors

Jennifer Koch, University of Konstanz
Carla Cirillo, Università degli Studi di Salerno
Sebastiano Battisti, Istituto Nanoscienze-CNR and Scuola Normale Superiore
Leon Ruf, University of Konstanz
Zahra Makhdoumi Kakhaki, Università degli Studi di Salerno
Alessandro Paghi, Istituto Nanoscienze-CNR and Scuola Normale Superiore
Armen Gulian, Chapman UniversityFollow
Serafim Teknowijoyo, Chapman University
Giorgio De Simoni, Istituto Nanoscienze-CNR and Scuola Normale Superiore
Francesco Giazotto, Istituto Nanoscienze-CNR and Scuola Normale Superiore
Carmine Attanasio, Università degli Studi di Salerno
Elke Scheer, University of Konstanz
Angelo Di Bernardo, University of Konstanz

Document Type

Article

Publication Date

4-22-2024

Abstract

The application of a gate voltage to control the superconducting current flowing through a nanoscale superconducting constriction, named as gate-controlled supercurrent (GCS), has raised great interest for fundamental and technological reasons. To gain a deeper understanding of this effect and develop superconducting technologies based on it, the material and physical parameters crucial for the GCS effect must be identified. Top-down fabrication protocols should also be optimized to increase device scalability, although studies suggest that top-down fabricated devices are more resilient to show a GCS. Here, we investigate gated superconducting nanobridges made with a top-down fabrication process from thin films of the non-centrosymmetric superconductor niobium rhenium with varying ratios of the constituents (NbRe). Unlike other devices previously reported and made with a top-down approach, our NbRe devices systematically exhibit a GCS effect when they were fabricated from NbRe thin films with small grain size and etched in specific conditions. These observations pave the way for the realization of top-down-made GCS devices with high scalability. Our results also imply that physical parameters like structural disorder and surface physical properties of the nanobridges, which can be in turn modified by the fabrication process, are crucial for a GCS observation, providing therefore also important insights into the physics underlying the GCS effect.

Comments

This article was originally published in Nano Research in 2024. https://doi.org/10.1007/s12274-024-6576-7

Recommended Citation

Koch, J., Cirillo, C., Battisti, S. et al. Gate-controlled supercurrent effect in dry-etched Dayem bridges of non-centrosymmetric niobium rhenium. Nano Res. (2024). https://doi.org/10.1007/s12274-024-6576-7

Peer Reviewed

1

Copyright

The authors

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 License.