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Out-of-equilibrium phonons in gated superconducting switches

Ritter, M. F. and Crescini, N. and Haxell, D. Z. and Hinderling, M. and Riel, H. and Bruder, C. and Fuhrer, A. and Nichele, F.. (2022) Out-of-equilibrium phonons in gated superconducting switches. Nature Electronics, 5 (2). pp. 71-77.

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Abstract

Recent experiments have suggested that superconductivity in metallic nanowires can be suppressed by the application of modest gate voltages. The source of this gate action has been debated and either attributed to an electric-field effect or to small leakage currents. Here we show that the suppression of superconductivity in titanium nitride nanowires on silicon substrates does not depend on the presence or absence of an electric field at the nanowire, but requires a current of high-energy electrons. The suppression is most efficient when electrons are injected into the nanowire, but similar results are obtained when electrons are passed between two remote electrodes. This is explained by the decay of high-energy electrons into phonons, which propagate through the substrate and affect superconductivity in the nanowire by generating quasiparticles. By studying the switching probability distribution of the nanowire, we also show that high-energy electron emission leads to a much broader phonon energy distribution compared with the case where superconductivity is suppressed by Joule heating near the nanowire.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Theoretische Physik (Bruder)
UniBasel Contributors:Bruder, Christoph
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Nature Research
e-ISSN:2520-1131
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
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Last Modified:09 Feb 2023 13:59
Deposited On:09 Feb 2023 13:59

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