Crossover from Josephson Effect to Single Interface Andreev Reflection in Asymmetric Superconductor/Nanowire Junctions

Crossover from Josephson Effect to Single Interface Andreev Reflection in Asymmetric Superconductor/Nanowire Junctions

We report on the fabrication and characterization of symmetric nanowire-based Josephson junctions, that is, Al- and Nb-based junctions, and asymmetric junctions employing superconducting Al and Nb. In the symmetric junctions, a clear and pronounced Josephson supercurrent is observed. These samples a...

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Veröffentlicht in:Nano letters 2014-09, Vol.14 (9), p.4977-4981
Hauptverfasser: Günel, H. Y, Borgwardt, N, Batov, I. E, Hardtdegen, H, Sladek, K, Panaitov, G, Grützmacher, D, Schäpers, Th
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container_end_page 4981
container_issue 9
container_start_page 4977
container_title Nano letters
container_volume 14
creator Günel, H. Y
Borgwardt, N
Batov, I. E
Hardtdegen, H
Sladek, K
Panaitov, G
Grützmacher, D
Schäpers, Th
description We report on the fabrication and characterization of symmetric nanowire-based Josephson junctions, that is, Al- and Nb-based junctions, and asymmetric junctions employing superconducting Al and Nb. In the symmetric junctions, a clear and pronounced Josephson supercurrent is observed. These samples also show clear signatures of subharmonic gap structures. At zero magnetic field, a Josephson coupling is found for the asymmetric Al/InAs-nanowire/Nb junctions as well. By applying a magnetic field above the critical field of Al or by raising the temperature above the critical temperature of Al the junction can be switched to an effective single-interface superconductor/nanowire structure. In this regime, a pronounced zero-bias conductance peak due to reflectionless tunneling has been observed.
doi_str_mv 10.1021/nl501350v
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title Crossover from Josephson Effect to Single Interface Andreev Reflection in Asymmetric Superconductor/Nanowire Junctions
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