This title appears in the Scientific Report :
2014
Please use the identifier:
http://dx.doi.org/10.1021/nl501350v in citations.
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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Personal Name(s): | Günel, H. Y. (Corresponding Author) |
---|---|
Borgwardt, N. / Batov, I. E. / Hardtdegen, Hilde / Sladek, Kamil / Panaitov, Gregory / Grützmacher, Detlev / Schäpers, Thomas | |
Contributing Institute: |
JARA-FIT; JARA-FIT Halbleiter-Nanoelektronik; PGI-9 |
Published in: | Nano letters, 14 (2014) S. 4977-4981 |
Imprint: |
Washington, DC
ACS Publ.
2014
|
PubMed ID: |
25118624 |
DOI: |
10.1021/nl501350v |
Document Type: |
Journal Article |
Research Program: |
Frontiers of charge based Electronics |
Publikationsportal JuSER |
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 theasymmetric Al/InAs-nanowire/Nb junctions as well. By applying a magnetic field above the criticalfield of Al or by raising the temperature above the critical temperature of Al the junction can be switched to an effective singleinterface superconductor/nanowire structure. In this regime, a pronounced zero-bias conductance peak due to reflectionless tunneling has been observed. |