Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction
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arXiv
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| Autori principali: | , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2023
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| author | Coraiola, M. Svetogorov, A. E. Haxell, D. Z. Sabonis, D. Hinderling, M. Kate, S. C. ten Cheah, E. Krizek, F. Schott, R. Wegscheider, W. Cuevas, J. C. Belzig, W. Nichele, F. |
| author_facet | Coraiola, M. Svetogorov, A. E. Haxell, D. Z. Sabonis, D. Hinderling, M. Kate, S. C. ten Cheah, E. Krizek, F. Schott, R. Wegscheider, W. Cuevas, J. C. Belzig, W. Nichele, F. |
| contents | 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 $|η|\approx34\%$, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_04415 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction Coraiola, M. Svetogorov, A. E. Haxell, D. Z. Sabonis, D. Hinderling, M. Kate, S. C. ten Cheah, E. Krizek, F. Schott, R. Wegscheider, W. Cuevas, J. C. Belzig, W. Nichele, F. Mesoscale and Nanoscale Physics Superconductivity 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 $|η|\approx34\%$, 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. |
| title | Flux-Tunable Josephson Diode Effect in a Hybrid Four-Terminal Josephson Junction |
| topic | Mesoscale and Nanoscale Physics Superconductivity |
| url | https://arxiv.org/abs/2312.04415 |