Transport studies in a gate-tunable three-terminal Josephson junction

Graziano, Gino V.; Lee, Joon Sue; Pendharkar, Mihir; Palmstrøm, C. J.; Pribiag, Vlad

doi:10.1103/physrevb.101.054510

Cited by 66 publications

(48 citation statements)

References 46 publications

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“…Indeed, the CCCs of such wide junctions are dramatically different from those reported here (Fig. S6 [55]), but they bear similarities to those reported in two recent experiments [44,58]. The contours are no longer convex in zero field and they shrink on increasing the field while keeping their inversion symmetry.…”

Section: Experiments Versus Theorysupporting

confidence: 51%

Multiterminal Josephson Effect

et al. 2020

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We report a probable observation of the dc Josephson effect in mesoscopic junctions of three and four superconductors. The devices are fabricated in a top-down fashion from a hybrid semiconductorsuperconductor InAs=Al epitaxial heterostructure. In general, the critical current of an N-terminal junction is an (N − 1)-dimensional hypersurface in the space of bias currents, which can be reduced to a set of critical current contours. The geometry of critical current contours exhibits nontrivial responses to electrical gating, magnetic field, and phase bias, and it can be reproduced by the scattering formulation of the Josephson effect generalized to the case of N > 2. Besides establishing solid ground beneath a host of recent theory proposals, our experiment accomplishes an important step toward creating trijunctions of topological superconductors, essential for braiding operations.

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Section: Experiments Versus Theorysupporting

confidence: 51%

Multiterminal Josephson Effect

et al. 2020

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“…Four terminals are thus needed to realize a Weyl point. This prediction gave rise to related experimental and theoretical research [22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 71%

Spintronics with a Weyl point in superconducting nanostructures

Chen

Nazarov

2021

Phys. Rev. B

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We investigate transport in a superconducting nanostructure housing a Weyl point in the spectrum of Andreev bound states. A minimum magnet state is realized in the vicinity of the point. One or more normal-metal leads are tunnel-coupled to the nanostructure. We have shown that this minimum magnetic setup is suitable for realization of all common goals of spintronics: detection of a magnetic state, conversion of electric currents into spin currents, potentially reaching the absolute limit of one spin per charge transferred, and detection of spin accumulation in the leads. The peculiarity and possible advantage of the setup is the ability to switch between magnetic and nonmagnetic states by tiny changes of the control parameters: superconducting phase differences. We employ this property to demonstrate the feasibility of less common spintronic effects: spin on demand and alternative spin current.

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“…[ 64 ] As a starting point, the experimental realization for the measurement of DC Josephson currents in multiterminal TSCs could be based on the promising experiments in multiterminal Josephson junctions with conventional superconductivity, where the superconductors are made of Al on top of an InAs 2DEG. [ 65–67 ]…”

Section: Discussionmentioning

confidence: 99%

Josephson and Persistent Currents in a Quantum Ring between Topological Superconductors

et al. 2021

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In this work, the spectra in an Aharonov–Bohm quantum‐ring interferometer forming a Josephson junction between two topological superconductor (TSC) nanowires are investigated. The TSCs host Majorana bound states at their edges, and both the magnetic flux and the superconducting phase difference between the TSCs are used as control parameters. A tight‐binding approach is used to model the quantum ring coupled to both TSCs, described by the Kitaev effective Hamiltonian. The problem is solved by means of exact numerical diagonalization of the Bogoliubov‐de Gennes Hamiltonian and obtain the spectra for two sizes of the quantum ring as a function of the magnetic flux and the phase difference between the TSCs. Depending on the size of the quantum ring and the coupling, the spectra display several patterns. Those are denoted as line, point, and undulated nodes, together with flat bands, which are topologically protected. The first three patterns can be possibly detected by means of persistent and Josephson currents. Hence, the results could be useful to understand the spectra and their relation with the behavior of the current signals.

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Transport studies in a gate-tunable three-terminal Josephson junction

Cited by 66 publications

References 46 publications

Multiterminal Josephson Effect

Multiterminal Josephson Effect

Spintronics with a Weyl point in superconducting nanostructures

Josephson and Persistent Currents in a Quantum Ring between Topological Superconductors

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