Observation of Supercurrent Enhancement in SNS Junctions by Nonequilibrium Injection into Supercurrent Carrying Bound Andreev States

Jonatan Kutchinsky; Rafael Taboryski; Claus B. Sørensen; Jørn Bindslev Hansen; Poul Erik Lindelof

doi:10.1103/PhysRevLett.83.4856

Observation of Supercurrent Enhancement in SNS Junctions by Nonequilibrium Injection into Supercurrent Carrying Bound Andreev States

Jonatan Kutchinsky, Rafael Taboryski, Claus B. Sørensen, Jørn Bindslev Hansen, and Poul Erik Lindelof

Phys. Rev. Lett. 83, 4856 – Published 6 December 1999

Abstract

We report for the first time enhancement of the supercurrent by means of injection in a mesoscopic three terminal planar SN-SNS device made of Al on GaAs. When a current is injected from one of the superconducting Al electrodes at an injection bias $V = Δ (T) / e$ , the dc Josephson current between the other two superconducting electrodes has a maximum, giving evidence for an enhancement due to a nonequilibrium injection into bound Andreev states of the underlying semiconductor. The effect persists to temperatures where the equilibrium supercurrent has vanished.

Received 30 July 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.4856

Authors & Affiliations

Jonatan Kutchinsky¹, Rafael Taboryski², Claus B. Sørensen³, Jørn Bindslev Hansen¹, and Poul Erik Lindelof³

¹Department of Physics, Technical University of Denmark, Building 309, DK-2800 Lyngby, Denmark
²Danish Institute of Fundamental Metrology, Anker Engelunds, Vej 1, DK-2800 Lyngby, Denmark
³Niels Bohr Institute, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen, Denmark