Supercurrent transport through 1$e$-periodic full-shell Coulomb islands

Abstract

We experimentally investigate supercurrent through Coulomb islands, where island and leads are fabricated from semiconducting nanowires with fully surrounding superconducting shells. Applying flux along the wire yields a series of destructive Little-Parks lobes with reentrant supercurrent. We find Coulomb blockade with 2$e$ peak spacing in the zeroth lobe and 1$e$ average spacing, with regions of significant even-odd modulation, in the first lobe. Evolution of Coulomb-peak amplitude through the first lobe is consistent with a theoretical model of supercurrent carried predominantly by zero-energy states in the leads and the island.

11 pages, 5+6 figures

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Cited by in corpus (8)

• Phenomenology of Majorana zero modes in full-shell hybrid nanowires
• Majorana modes in quantum dots coupled via a floating superconducting island
• Josephson effect and critical currents in trivial and topological full-shell hybrid nanowires
• Absence of Majorana oscillations in finite-length full-shell hybrid nanowires
• Subgap transport in superconductor--semiconductor hybrid islands: Weak and strong coupling regimes
• Subgap states in semiconductor-superconductor devices for quantum technologies: Andreev qubits and minimal Majorana chains
• Caroli-de Gennes-Matricon Analogs in Full-Shell Hybrid Nanowires
• Fluxoid solitons in superconducting tapered tubes and bottlenecks