Josephson inductance as a probe for highly ballistic semiconductor-superconductor weak links

Abstract

We present simultaneous measurements of Josephson inductance and DC transport characteristics of ballistic Josephson junctions based upon an epitaxial Al-InAs heterostructure. The Josephson inductance at finite current bias directly reveals the current-phase relation. The proximity-induced gap, the critical current and the average value of the transparency $\bar{\tau }$ are extracted without need for phase bias, demonstrating, e.g.,~a near-unity value of $\bar{\tau }=0.94$. Our method allows us to probe the devices deeply in the non-dissipative regime, where ordinary transport measurements are featureless. In perpendicular magnetic field the junctions show a nearly perfect Fraunhofer pattern of the critical current, which is insensitive to the value of $\bar{\tau }$. In contrast, the signature of supercurrent interference in the inductance turns out to be extremely sensitive to $\bar{\tau }$.

13 pages, 13 figures

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• Link between supercurrent diode and anomalous Josephson effect revealed by gate-controlled interferometry
• Quantum circuits with multiterminal Josephson-Andreev junctions
• Anisotropic vortex squeezing in synthetic Rashba superconductors: a manifestation of Lifshitz invariants
• Near-surface InAs 2DEG on a GaAs substrate: characterization and superconducting proximity effect
• InAs on Insulator: A New Platform for Cryogenic Hybrid Superconducting Electronics
• Evidence of Josephson coupling in a few-layer black phosphorus planar Josephson junction
• Flip-chip-based fast inductive parity readout of a planar superconducting island
• Spontaneous supercurrents and vortex depinning in two-dimensional arrays of ${\phi }_0$-junctions
• Anomalous Andreev interferometer: Study of an anomalous Josephson junction coupled to a normal wire
• Radio-frequency characterization of a supercurrent transistor made from a carbon nanotube
• Antichiral edge states and Bogoliubov Fermi surfaces in a two-dimensional proximity-induced superconductor
• Gate-controlled Supercurrent in Ballistic InSb Nanoflag Josephson Junctions
• Measurements of cyclotron resonance of the interfacial states in strong spin-orbit coupled 2D electron gases proximitized with aluminum