Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 30: Superconductivity: Poster Session

TT 30.12: Poster

Donnerstag, 8. September 2022, 15:00–18:00, P1

Gate-voltage mediated supercurrent suppression in a superconducting nano-bridge — •Subrata Chakraborty, Danilo Nikolic, and Wolfgang Belzig — Fachbereich Physik, Universität Konstanz, D-78467 Konstanz, Germany

Voltage-gated supercurrent suppression in a superconducting nano-bridge is a hot topic for research in present days. Recent experiments on this effect demonstrate a sudden supercurrent suppression in the bridge with high gate-voltage [1-6]. The microscopic understanding of this is not settled till now. According to the experimental researches, there are three distinct tentative mechanisms, which could be responsible for this event. These mechanisms suggest that at high gate voltage there could be either a direct surface-pair breaking-induced phase transition, superconductivity suppression with induced nonequilibrium phonon distribution due to Joule heating in the gate or supercurrent suppression due to nonequilibrium electronic quasiparticles via a direct small leakage current. In our work, we theoretically investigate the role of gate-voltage induced surface-pair breaking on the supercurrent suppression of superconducting nano-bridge. We speculate this work would present some generic theoretical predictions of this effect allowing to further test it experimentally.

[1] M. Rocci et al. ACS Nano, 14, 12621 (2020)
[2] I. Golokolenov et al, Nat. Commun., 12, 2747 (2021)
[3] L.D. Alegria et al., Nat. Nanotechnol., 16, 404 (2021)