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Transport of Non-Equilibrium Quasiparticle Excitations in Superconducting Aluminum

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Bulletin of the Russian Academy of Sciences: Physics Aims and scope


The electron transport of non-equilibrium quasiparticles injected into superconducting aluminum from a normal metal has been experimentally studied at ultralow temperatures. We studied hybrid nanostructures in the form of a T-shaped normal metal electrode (copper)—a dielectric tunnel layer (aluminum oxide)—a superconducting fork (aluminum), which can be considered as a solid-state analogue of a double-slit optical interferometer. At fixed bias voltages larger than the superconducting gap, a non-monotonic dependence of the tunnel current on perpendicular magnetic field has been observed. The effect is interpreted as the presence of a coherent component of the quasiparticle current.

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The authors are grateful to Terhi Hongisto for her assistance in preparing the samples.


The work was supported by the Russian Science Foundation, project no. 23-72-00018 “Study of nonequilibrium and boundary phenomena in superconducting hybrid nanostructures”.

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Correspondence to K. Yu. Arutyunov.

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Gurskiy, A.S., Shapovalov, D.L. & Arutyunov, K.Y. Transport of Non-Equilibrium Quasiparticle Excitations in Superconducting Aluminum. Bull. Russ. Acad. Sci. Phys. 88, 809–814 (2024).

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