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<p>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 <i>h</i>/<i>e</i> 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., <i>h</i>/2<i>e</i>, 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.</p>

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Flux-periodic supercurrent oscillations in an Aharonov–Bohm-type nanowire Josephson junction

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月1日

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  • Patrick Zellekens,
  • Russell S. Deacon,
  • Farah Basaric,
  • Raghavendra Juluri,
  • Michael D. Randle,
  • Benjamin Bennemann,
  • Christoph Krause,
  • Erik Zimmermann,
  • Ana M. Sanchez,
  • Detlev Grützmacher,
  • Alexander Pawlis,
  • Koji Ishibashi,
  • Thomas Schäpers

摘要

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.