Half-integer Shapiro steps in highly transmissive InSb nanoflag Josephson junctions

Abstract

We investigate a ballistic InSb nanoflag-based Josephson junction with Nb superconducting contacts. The high transparency of the superconductor-semiconductor interfaces enables the exploration of quantum transport with parallel short and long conducting channels. Under microwave irradiation, we observe half-integer Shapiro steps that are robust to temperature, suggesting their possible non-equilibrium origin. Our results demonstrate the potential of ballistic InSb nanoflags Josephson junctions as a valuable platform for understanding the physics of hybrid devices and investigating their non-equilibrium dynamics.

arXiv comment37 pages, 14 figures

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• Parity-conserving Cooper-pair transport and ideal superconducting diode in planar Germanium
• Charge-4e supercurrent in a two-dimensional InAs-Al superconductor-semiconductor heterostructure
• Anomalous supercurrent and diode effect in locally perturbed topological Josephson junctions
• Probing Topological Superconductivity of oxide nanojunctions using fractional Shapiro steps
• From nonreciprocal to charge-4e supercurrents in Ge-based Josephson devices with tunable harmonic content
• Supercurrent, Multiple Andreev Reflections and Shapiro Steps in InAs Nanosheet Josephson Junctions
• InAs on Insulator: A New Platform for Cryogenic Hybrid Superconducting Electronics
• Superconducting Quantum Interference Devices based on InSb nanoflag Josephson junctions
• Biharmonic-Drive Tunable Josephson Diode
• Tunable superconducting diode effect in higher-harmonic InSb nanosheet interferometers
• Side-gate modulation of supercurrent in InSb nanoflag-based Josephson junctions
• Supercurrent modulation in InSb nanoflag-based Josephson junctions by scanning gate microscopy
• Signatures of Majorana bound states in scanning gate microscopy of hybrid nanowires
• Spin splitting, Kondo correlation and singlet-doublet quantum phase transition in a superconductor-coupled InSb nanosheet quantum dot