Dynamical Stabilization of Multiplet Supercurrents in Multiterminal Josephson Junctions

Arnault, Ethan G.; Idris, Sara; McConnell, Aeron; Zhao, Lingfei; Larson, Trevyn F. Q.; Watanabe, Kenji; Taniguchi, Takashi; Finkelstein, Gleb; Amet, François

doi:10.1021/acs.nanolett.2c01999

Cited by 25 publications

(9 citation statements)

References 36 publications

(66 reference statements)

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“…These three sets of MAR signatures can be understood as independent Andreev reflections between all three pairs of terminals. We also observe a signature of Cooper quartet transport 35 – 38 , 42 , indicated by a lower resistance feature along the line V 1 = − V 2 . The differential resistance maps can also be plotted as a function of V 1 , V 2 where the quartet signature is clearly visible along the V 1 = − V 2 diagonal (see Supplementary Fig.…”

Section: Resultsmentioning

confidence: 81%

Selective control of conductance modes in multi-terminal Josephson junctions

et al. 2022

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The Andreev bound state spectra of multi-terminal Josephson junctions form an artificial band structure, which is predicted to host tunable topological phases under certain conditions. However, the number of conductance modes between the terminals of a multi-terminal Josephson junction must be few in order for this spectrum to be experimentally accessible. In this work, we employ a quantum point contact geometry in three-terminal Josephson devices to demonstrate independent control of conductance modes between each pair of terminals and access to the single-mode regime coexistent with the presence of superconducting coupling. These results establish a full platform on which to realize tunable Andreev bound state spectra in multi-terminal Josephson junctions.

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Section: Resultsmentioning

confidence: 81%

Selective control of conductance modes in multi-terminal Josephson junctions

et al. 2022

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“…Our devices are based on multiterminal Josephson junctions made in graphene. In the past few years, the multiterminal junctions have been realized in a variety of materials [36][37][38][39][40][41] and have even found a foothold as a solution to technological problems [42,43].…”

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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“…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%

“…Recent studies have also reported signatures of quartet pairings [23,25,30], arising from crossed Andreev reflection processes. However, studies of threeterminal Josephson junctions [24] and a network of tunnel junctions [31] argue that the resonant features may also arise from circuit-network effects.…”

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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Dynamical Stabilization of Multiplet Supercurrents in Multiterminal Josephson Junctions

Cited by 25 publications

References 36 publications

Selective control of conductance modes in multi-terminal Josephson junctions

Selective control of conductance modes in multi-terminal Josephson junctions

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

Andreev processes in mesoscopic multi-terminal graphene Josephson junctions

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