Selective Control of Conductance Modes in Multi-terminal Josephson Junctions

Graziano, Gino V.; Gupta, Mohit; Pendharkar, Mihir; Dong, Jason T.; Dempsey, Connor P.; Palmstrøm, Chris; Pribiag, Vlad S.

doi:10.48550/arxiv.2201.01373

Cited by 5 publications

(7 citation statements)

References 43 publications

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“…In this work, we show experimentally that the Josephson diode effect can occur in a relatively simple platform: a three-terminal Josephson device based on an InAs two-dimensional electron gas (2DEG) proximitized by epitaxial aluminum [21,23]. We show by means of simulations that this diode effect is a consequence of the synthetic realization of a π-periodic Josephson current-phase relation in our device.…”

Section: Introductionmentioning

confidence: 82%

“…Experimental investigations of Andreev bound state spectra in multi-terminal Josephson devices have attracted considerable attention recently due to proposed topologically protected subgap states [15][16][17][18][19][20]. Despite technical challenges in realizing these subgap states, other interesting transport phenomena such as multi-terminal Andreeev reflections [21][22][23],…”

Section: Introductionmentioning

confidence: 99%

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Superconducting Diode Effect in a Three-terminal Josephson Device

Gupta¹,

Graziano²,

Pendharkar³

et al. 2022

Preprint

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The phenomenon of non-reciprocal critical current in a Josephson device, termed Josephson diode effect, has garnered much recent interest. It is typically attributed to spin-orbit interaction and time reversal symmetry breaking in these systems. Here we report observation of the Josephson diode effect in a three-terminal Josephson device based upon InAs quantum well two-dimensional electron gas proximitized by epitaxial aluminum. We demonstrate that the diode efficiency can be tuned by a small out-of-plane magnetic field and electrostatic gating. We show that the diode effect in this device is a consequence of artificial realization of a current-phase relation that is non-2π-periodic.These Josephson devices may serve as gate tunable building blocks in designing topologically protected qubits. Furthermore, we show that the diode effect is an inherent property of multiterminal Josephson devices. This establishes an immediately scalable approach by which potential applications of the Josephson diode effect can be realized, which is agnostic to the underlying material platform.

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Section: Introductionmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

Superconducting Diode Effect in a Three-terminal Josephson Device

Gupta¹,

Graziano²,

Pendharkar³

et al. 2022

Preprint

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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%

“…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]. Additionally, these experiments studied the non-trivial geometric response of the critical current contour (CCC), a generic characteristic defining the region in which all the superconducting terminals are at zero voltage [26].…”

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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Selective Control of Conductance Modes in Multi-terminal Josephson Junctions

Cited by 5 publications

References 43 publications

Superconducting Diode Effect in a Three-terminal Josephson Device

Superconducting Diode Effect in a Three-terminal Josephson Device

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

Andreev processes in mesoscopic multi-terminal graphene Josephson junctions

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