Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction
Source abstract
Abstract
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 |η| ≈ 34%, 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 nonsinusoidal 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 generated on the chip break both time-reversal and spatial symmetries. Our work presents an approach for developing Josephson diodes with wide-range tunability that do not rely on exotic materials.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Physics of Superconductivity and Magnetism · Quantum and electron transport phenomena · Atomic and Subatomic Physics Research
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
IBM Research Europe─Zurich, 8803 Rüschlikon, Switzerland
Fachbereich Physik, Universität Konstanz, D-78457 Konstanz, Germany
Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
Institute of Physics, Czech Academy of Sciences, 162 00 Prague, Czech Republic
Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center (IFIMAC), Universidad Autónoma de Madrid, E-28049 Madrid, Spain
Funding
European Research Council · Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung · Ministerio de Ciencia e Innovaci?n · Deutsche Forschungsgemeinschaft
References (55)
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