Andreev processes in mesoscopic multiterminal graphene Josephson junctions

Zhang, Fan; Rashid, Asmaul Smitha; Ahari, Mostafa Tanhayi; Zhang, Wei; Mekkanamkulam, Ananthanarayanan, Krishnan; Xiao, Run; Coster, George J. de; Gilbert, Matthew J.; Samarth, N.; Kayyalha, Morteza

doi:10.1103/physrevb.107.l140503

Cited by 12 publications

(2 citation statements)

References 43 publications

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“…Experiments have addressed either three terminals but two being equipotential [19], or three independent terminals, i.e., biased with different voltages, the latter corresponding to the present study. Experiments involve junctions made of a diffusive metal [20], clean nanowires [21,22] or 2D electron gas [23][24][25], and multichannel graphene [26][27][28][29][30]. Transport in multiterminal junctions enables DC phase-coherent transport at nonzero but commensurate voltages [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Quartet currents in a biased three-terminal diffusive Josephson junction

Jonckheere,

Rech,

Padurariu

et al. 2023

Phys. Rev. B

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Section: Introductionmentioning

confidence: 99%

Quartet currents in a biased three-terminal diffusive Josephson junction

Jonckheere,

Rech,

Padurariu

et al. 2023

Phys. Rev. B

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“…Initial experiments identified the JDE and ascribed it to phase-drag effects . Coupling between JJs hosting ABSs realizes Andreev molecules, − which also give rise to the JDE. , Another line of research focused on multiterminal devices featuring more than two current ports. , In this configuration, a bias current applied to one lead controls the switching current and its nonreciprocity measured between two other leads. Furthermore, the JDE was achieved by engineering higher harmonics in the CPR of a three-terminal JJ network threaded by a magnetic flux …”

mentioning

confidence: 99%

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

Coraiola,

Svetogorov,

Haxell

et al. 2024

ACS Nano

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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, phasetunable 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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