Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction
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Date
2024-03-26
Publication Type
Journal Article
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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 |eta| approximate to 34%, is widely tunable & horbar;both in amplitude and sign & horbar;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.
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published
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Journal / series
Volume
18 (12)
Pages / Article No.
9221 - 9231
Publisher
American Chemical Society
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Subject
superconducting diode effect; multiterminal Josephsonjunction; superconductor-semiconductor hybrid; 2DEG; nonreciprocal transport
Organisational unit
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
03833 - Wegscheider, Werner / Wegscheider, Werner
Notes
Funding
207538 - Quantum correlations in highest-purity III/V semiconductors and superconductor hybrid systems (SNF)