Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction

We investigate the direction-dependent switching current in a flux-tunable four-terminal Josephson junction defined in an InAs/Al two-dimensional heterostructure. The device exhibits the Josephson diode effect, with switching currents that depend on the sign of the bias current. The superconducting...

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Bibliographic Details
Published in:arXiv.org 2023-12
Main Authors: Coraiola, M, Svetogorov, A E, Haxell, D Z, Sabonis, D, Hinderling, M, ten Kate, S C, Cheah, E, Krizek, F, Schott, R, Wegscheider, W, Cuevas, J C, Belzig, W, Nichele, F
Format: Article
Language:English
Subjects:
Circuits
Heterostructures
Josephson junctions
Magnetic flux
Switching
Online Access:Get full text
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Summary:We investigate the direction-dependent switching current in a flux-tunable four-terminal Josephson junction defined in an InAs/Al two-dimensional heterostructure. The device exhibits the Josephson diode effect, with switching currents that depend on the sign of the bias current. The superconducting diode efficiency, reaching a maximum of \(|\eta|\approx34\%\), is widely tunable - both in amplitude and sign - as a function of magnetic fluxes and gate voltages. Our observations are supported by a circuit model of three parallel Josephson junctions with non-sinusoidal current-phase relation. With respect to conventional Josephson interferometers, phase-tunable multiterminal Josephson junctions enable large diode efficiencies in structurally symmetric devices, where local magnetic fluxes break both time-reversal and spatial-inversion symmetries. Our work establishes a pathway to develop Josephson diodes with wide-range tunability and that do not rely on exotic materials or externally applied magnetic fields.
ISSN:2331-8422
DOI:10.48550/arxiv.2312.04415