Journal Article

FZJ-2026-04233

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Flux-periodic supercurrent oscillations in an Aharonov–Bohm-type nanowire Josephson junction

Zellekens, P. (Corresponding author)FZJ* ; Deacon, R. S. ; Basaric, F.FZJ* ; Juluri, R. ; Randle, M. D. ; Bennemann, B.FZJ* ; Krause, C.FZJ* ; Zimmermann, E.FZJ* ; Sanchez, A. M. ; Grützmacher, D.FZJ* ; Pawlis, A.FZJ* ; Ishibashi, K. ; Schäpers, T.FZJ*

2025
Springer Nature London

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Please use a persistent id in citations: doi:10.1038/s42005-025-02242-7  doi:10.34734/FZJ-2026-04233

Abstract: Recent theoretical studies highlight hollow-core semiconductor-superconductor hybrid nanowires as a promising platform to engineer topological superconductivity via the Little-Parks effect and phase-winding of the superconducting order parameter. Such nanowires exhibit enhanced spatial confinement of carriers, potentially enlarging the accessible topological phase space compared to conventional core/full-shell structures. Inspired by these insights and as an essential preliminary step, we experimentally investigate GaAs/InAs core/shell nanowires with aluminum half-shells, aiming to understand how Andreev-bound states are influenced by their complex geometric confinement. With normal contacts we observed pronounced h/e flux periodic oscillations in the magnetoconductance, which can be explained via the presence of a tubular conductive channel in the InAs shell. Conversely, the switching current in Josephson junctions oscillates with approximately half that period, i.e., h/2e, indicating a full proximitization of the InAs shell from the half-shell superconducting contacts and a successful imprint of the non-trivial geometric topology onto the Andreev transport spectrum in the junction enclosing threading magnetic flux. On these structures, we systematically studied the gate-, field-, and temperature-dependent evolution of the supercurrent.

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Contributing Institute(s):

1. Halbleiter-Nanoelektronik (PGI-9)
2. JARA Institut Green IT (PGI-10)
3. JARA-FIT (JARA-FIT)

Research Program(s):

1. 5222 - Exploratory Qubits (POF4-522) (POF4-522)

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