Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction.
ACS Nano
; 18(12): 9221-9231, 2024 Mar 26.
Article
em En
| MEDLINE
| ID: mdl-38488287
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 tunableâboth in amplitude and signâas 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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01-internacional
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MEDLINE
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En
Ano de publicação:
2024
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Article