Journal Article

FZJ-2014-04975

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Crossover from Josephson Effect to Single Interface Andreev Reflection in Asymmetric Superconductor/Nanowire Junctions

Günel, H. Y. (Corresponding Author) ; Borgwardt, N. ; Batov, I. E. ; Hardtdegen, H.FZJ* ; Sladek, K. ; Panaitov, G.FZJ* ; Grützmacher, D.FZJ* ; Schäpers, T.FZJ*

2014
ACS Publ. Washington, DC

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Please use a persistent id in citations: doi:10.1021/nl501350v

Abstract: 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.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA-FIT (JARA-FIT)

Research Program(s):

1. 421 - Frontiers of charge based Electronics (POF2-421) (POF2-421)

Appears in the scientific report 2014

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Database coverage:
; JCR ; NCBI Molecular Biology Database ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection ; Zoological Record

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