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

E. V. Shpagina; E. S. Tikhonov; D. Ruhstorfer; G. Koblmüller; V. S. Khrapai

doi:10.1103/l4tq-bxq9

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

E. V. Shpagina, E. S. Tikhonov, D. Ruhstorfer, G. Koblmüller, V. S. Khrapai

DOI 10.1103/l4tq-bxq9 · Physical Review B

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Abstract

We investigate a nonequilibrium 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 behavior 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 behavior in terms of a tiny nonequilibrium correction to the electronic energy distribution at low energies. The experiment demonstrates a critical failure of a two-temperature nonequilibrium model of the superconductor-normal transition in floating islands of hybrid nanowire devices.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.23	Pressure not reported	unknown