Two-dimensional Josephson vortex lattice and anomalously slow decay of the Fraunhofer oscillations in a ballistic SNS junction with a warped Fermi surface

Ostroukh, Viacheslav; Baxevanis, B.; Akhmerov, A. R.; Beenakker, C. W. J.

doi:10.1103/physrevb.94.094514

Cited by 21 publications

(18 citation statements)

References 32 publications

(62 reference statements)

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“…Up to now both kinds of vortices were observed only in the diffusive regime. Extending experimental studies to the ballistic limit 52 is a challenging task for the future.…”

Section: Discussionmentioning

confidence: 99%

Expansion of a superconducting vortex core into a diffusive metal

et al. 2018

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Vortices in quantum condensates exist owing to a macroscopic phase coherence. Here we show, both experimentally and theoretically, that a quantum vortex with a well-defined core can exist in a rather thick normal metal, proximized with a superconductor. Using scanning tunneling spectroscopy we reveal a proximity vortex lattice at the surface of 50 nm—thick Cu-layer deposited on Nb. We demonstrate that these vortices have regular round cores in the centers of which the proximity minigap vanishes. The cores are found to be significantly larger than the Abrikosov vortex cores in Nb, which is related to the effective coherence length in the proximity region. We develop a theoretical approach that provides a fully self-consistent picture of the evolution of the vortex with the distance from Cu/Nb interface, the interface impedance, applied magnetic field, and temperature. Our work opens a way for the accurate tuning of the superconducting properties of quantum hybrids.

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“…Up to now both kinds of vortices were observed only in the diffusive regime. Extending experimental studies to the ballistic limit 52 is a challenging task for the future.…”

Section: Discussionmentioning

confidence: 99%

Expansion of a superconducting vortex core into a diffusive metal

et al. 2018

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“…Such a large extent would lead to a supercurrent suppression for fields much below the 10 000 gauss range, so that this effect cannot explain the strong lateral confinement we observe. Another interesting possibility, edge supercurrents induced by two-dimensional vortex lattice formation because of Fermi surface warping [40], also seems unlikely because such Fermi surface warping was not observed in the previous angular-resolved photoemission spectroscopy of similar graphene=WS 2 samples [41].…”

mentioning

confidence: 89%

Spin-Orbit-Enhanced Robustness of Supercurrent in Graphene/WS2 Josephson Junctions

Wakamura

Chepelianskii

et al. 2020

Phys. Rev. Lett.

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We demonstrate the enhanced robustness of the supercurrent through graphene-based Josephson junctions in which strong spin-orbit interactions (SOIs) are induced. We compare the persistence of a supercurrent at high out-of-plane magnetic fields between Josephson junctions with graphene on hexagonal boron-nitride and graphene on WS 2 , where strong SOIs are induced via the proximity effect. We find that in the shortest junctions both systems display signatures of induced superconductivity, characterized by a suppressed differential resistance at a low current, in magnetic fields up to 1 T. In longer junctions, however, only graphene on WS 2 exhibits induced superconductivity features in such high magnetic fields, and they even persist up to 7 T. We argue that these robust superconducting signatures arise from quasiballistic edge states stabilized by the strong SOIs induced in graphene by WS 2 .

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“…To proceed further, we follow the methodology outlined in Refs. [55] and [56]. The Josephson current is usually evaluated in the normal weak-link region, where the electrical current is conserved.…”

Section: Kwant Transport Simulations Theoretical Modelmentioning

confidence: 99%

A Josephson junction supercurrent diode

Baumgartner,

Fuchs,

Costa

et al. 2021

Preprint

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Transport is called nonreciprocal when not only the sign, but also the absolute value of the current, depends on the polarity of the applied voltage. It requires simultaneously broken inversion and time-reversal symmetries, e.g., by the interplay of spin-orbit coupling and magnetic field. So far, observation of nonreciprocity was always tied to resistivity, and dissipationless nonreciprocal circuit elements were elusive. Here, we engineer fully superconducting nonreciprocal devices based on highly-transparent Josephson junctions fabricated on InAs quantum wells. We demonstrate supercurrent rectification far below the transition temperature. By measuring Josephson inductance, we can link nonreciprocal supercurrent to the asymmetry of the current-phase relation, and directly derive the supercurrent magnetochiral anisotropy coefficient for the first time. A semi-quantitative model well explains the main features of our experimental data. Nonreciprocal Josephson junctions have the potential to become for superconducting circuits what pn-junctions are for traditional electronics, opening the way to novel nondissipative circuit elements.

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Two-dimensional Josephson vortex lattice and anomalously slow decay of the Fraunhofer oscillations in a ballistic SNS junction with a warped Fermi surface

Cited by 21 publications

References 32 publications

Expansion of a superconducting vortex core into a diffusive metal

Expansion of a superconducting vortex core into a diffusive metal

Spin-Orbit-Enhanced Robustness of Supercurrent in Graphene/WS2 Josephson Junctions

A Josephson junction supercurrent diode

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