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arXiv · 2506.20408

Superconducting bistability in floating Al islands of hybrid Al/InAs nanowires

E. V. Shpagina·E. S. Tikhonov·D. Ruhstorfer·G. Koblmueller·V. S. Khrapai
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Abstract

We investigate a non-equilibrium aspect of the current-driven superconducting-normal phase transition in floating Al islands of epitaxial full-shell Al/InAs nanowires. Within a transition region discontinuous voltage jumps and hysteretic behaviour of the I-V characteristics are observed, associated with the destruction and recovery of the superconducting order parameter in the island. The strength of the two features varies strongly in different devices in a mutually correlated way and can be suppressed by a small magnetic field. Numerical calculation explains this behaviour in terms of a tiny non-equilibrium correction to the electronic energy distribution at low energies. The experiment demonstrates a critical failure of a two-temperature non-equilibrium model of the superconductor-normal transition in floating islands of hybrid nanowire devices.

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E. V. Shpagina, E. S. Tikhonov, D. Ruhstorfer, G. Koblmueller, V. S. Khrapai. 2025-06-25. Superconducting bistability in floating Al islands of hybrid Al/InAs nanowires. https://doi.org/10.1103/l4tq-bxq9

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