Experimental investigation of supercurrent enhancement in S-N-S junctions by non-equilibrium injection into supercurrent-carrying bound Andreev states

Jonatan Kutchinsky, Rafael Jozef Taboryski, C B Sørensen, Jørn Bindslev Hansen, Poul Erik Lindelof

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Abstract

We report measurements on three-terminal superconductor-semiconductor-superconductor injection devices demonstrating enhancement of the supercurrent by injection from a superconducting injector electrode. Two other electrodes were used to form the detector junction. Applying a small voltage to the injector electrode reduced the maximum supercurrent (the critical current) between the detector electrodes. When the injector voltage was increased further (upto the gap voltage Delta / e), the critical current between the detector electrodes increased and approached a new maximum. This is evidence of enhancement of the supercurrent by non-equilibrium injection into bound supercurrent-carrying Andreev states. The effect persists to temperatures where the equilibrium supercurrent has vanished. (C) 2001 Elsevier Science B.V. All rights reserved.
Original languageEnglish
JournalPhysica C: Superconductivity and its Applications
Volume352
Issue number1-4
Pages (from-to)4-10
ISSN0921-4534
Publication statusPublished - 2001

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