Superconducting Diode Effect in a Three-terminal Josephson Device

Gupta, Mohit; Graziano, Gino V.; Pendharkar, Mihir; T., Dong, Jason; Dempsey, Connor; Palmstrøm, C. J.; Pribiag, Vlad

doi:10.48550/arxiv.2206.08471

Cited by 4 publications

(4 citation statements)

References 41 publications

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“…In the meanwhile, it has been realized that higher superconducting diode efficiency can be achieved in properly designed nanostructures with an external magnetic field applied to break the time-reversal symmetry [31][32][33][34][35]. Unfortunately, magnetic field is often undesired for integrating the diodes in superconducting circuits.…”

Section: Introductionmentioning

confidence: 99%

Non-Reciprocal Supercurrents in a Field-Free Graphene Josephson Triode

Chiles¹,

Arnault²,

Chen³

et al. 2022

Preprint

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Superconducting diodes are proposed non-reciprocal circuit elements that should exhibit nondissipative transport in one direction while being resistive in the opposite direction. Multiple examples of such devices have emerged in the past couple of years, however their efficiency is typically limited, and most of them require magnetic field to function. Here we present a device achieving efficiencies upwards of 90% while operating at zero field. Our samples consist of a network of three graphene Josephson junctions linked by a common superconducting island, to which we refer as a Josephson triode. The triode is tuned by applying a control current to one of the contacts, thereby breaking the time-reversal symmetry of the current flow. The triode's utility is demonstrated by rectifying a small (tens of nA amplitude) applied square wave. We speculate that devices of this type could be realistically employed in the modern quantum circuits.

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Section: Introductionmentioning

confidence: 99%

Non-Reciprocal Supercurrents in a Field-Free Graphene Josephson Triode

Chiles¹,

Arnault²,

Chen³

et al. 2022

Preprint

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“…The resultant band structure may display topological properties such as Weyl singularities [10,11]. While providing strong motivation for MTJJs have been experimentally explored in various materials platforms including graphene/MoRe [22][23][24] and InAs/Al [25][26][27][28][29]. These experiments focused on the gate and magnetic field dependence of the supercurrent flow between adjacent and nonadjacent superconducting terminals [27].…”

Section: Introductionmentioning

confidence: 99%

Andreev processes in mesoscopic multi-terminal graphene Josephson junctions

Zhang¹,

Rashid²,

Ahari³

et al. 2022

Preprint

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There is growing interest in using multi-terminal Josephson junctions (MTJJs) as a platform to artificially emulate topological phases and to investigate complex superconducting mechanisms such as quartet and multiplet Cooper pairings. Current experimental signatures in MTJJs have led to conflicting interpretations of the salient features. In this work, we report a collaborative experimental and theoretical investigation of graphene-based four-terminal Josephson junctions. We observe resonant features in the differential resistance maps that resemble those ascribed to multiplet Cooper pairings. To understand these features, we model our junctions using a circuit network of coupled two-terminal resistively and capacitively shunted junctions (RCSJs). Under appropriate bias current, the model predicts that supercurrent flow between two terminals in a four-terminal geometry may be represented as a sinusoidal function of a weighted sum of the superconducting phases. We find that the resonant features generated by the RCSJ model are insensitive to the diffusive or ballistic form of the current-phase relation and junction transparency. Our study suggests that differential resistance measurements alone are insufficient to conclusively distinguish resonant Andreev reflection processes from semi-classical circuit-network effects.

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“…The first experimental report on the SDE, based on electrically polar materials, 10 has appeared very recently, demonstrating supercurrent rectification. Soon after, other systems [11][12][13][14][15][16][17][18][19][20][21][22] have been inspected looking at supercurrent non-reciprocal transport, complemented by theoretical efforts, 9,[23][24][25][26][27][28][29][30][31][32] in order to shed light on the microscopic mechanisms responsible for the SDE. However, both from an experimental and a theoretical point of view, this field is still in its infancy with several open questions.…”

Section: Introductionmentioning

confidence: 99%

Josephson Diode Effect in High Mobility InSb Nanoflags

Turini¹,

Salimian²,

Carrega³

et al. 2022

Preprint

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We report evidence of non-reciprocal dissipation-less transport in single ballistic InSb nanoflag Josephson junctions, owing to a strong spin-orbit coupling. Applying an in-plane magnetic field, we observe an inequality in supercurrent for the two opposite current propagation directions. This demonstrates that these devices can work as Josephson diodes, with dissipation-less current flowing in only one direction. For small fields, the supercurrent asymmetry increases linearly with the external field, then it saturates as the Zeeman energy becomes relevant, before it finally decreases to zero at higher fields. We show that the effect is maximum when the in-plane field is perpendicular to the current vector, which identifies Rashba spin-orbit coupling as the main symmetry-breaking mechanism. While a variation in carrier concentration in these high-quality InSb nanoflags does not significantly influence the diode effect, it is instead strongly suppressed by an increase in temperature. Our experimental findings are consistent with a model for ballistic short junctions and show that the diode effect

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Superconducting Diode Effect in a Three-terminal Josephson Device

Cited by 4 publications

References 41 publications

Non-Reciprocal Supercurrents in a Field-Free Graphene Josephson Triode

Non-Reciprocal Supercurrents in a Field-Free Graphene Josephson Triode

Andreev processes in mesoscopic multi-terminal graphene Josephson junctions

Josephson Diode Effect in High Mobility InSb Nanoflags

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