Nonequilibrium superconductivity in mesoscopic Nb/InAs/Nb junctions

Lehnert, K. W.; Harris, J.; Allen, S. J.; Argaman, Nathan

doi:10.1006/spmi.1999.0725

Cited by 7 publications

(3 citation statements)

References 19 publications

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“…This is of great relevance for all the experiments using low-dimensional barriers, which should be concerned about possible heating effects, leading to distorted phase information. Non-equilibrium effects would obviously invalidate a large number of key predictions for Majorana fermions and nanoscale superconductivity in Josephson junctions, since for instance they can give rise to zero bias anomalies in conductance measurements 52 . The proof of quantifiable non-equilibrium processes already in the thermal regime poses severe constraints on the possible occurrence of macroscopic quantum phenomena at lower temperatures in high J c samples through standard SCD measurements.…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Breakdown of the escape dynamics in Josephson junctions

Massarotti

Stornaiuolo

Lucignano³

et al. 2015

Phys. Rev. B

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We have identified anomalous behavior of the escape rate out of the zero-voltage state in Josephson junctions with a high critical current density J c . For this study we have employed YBa 2 Cu 3 O 7-x grain boundary junctions, which span a wide range of J c and have appropriate electrodynamical parameters. Such high J c junctions, when hysteretic, do not switch from the superconducting to the normal state following the expected stochastic Josephson distribution, despite having standard Josephson properties such as a Fraunhofer magnetic field pattern. The switching current distributions (SCDs) are consistent with nonequilibrium dynamics taking place on a local rather than a global scale. This means that macroscopic quantum phenomena seem to be practically unattainable for high J c junctions. We argue that SCDs are an accurate means to measure nonequilibrium effects. This transition from global to local dynamics is of relevance for all kinds of weak links, including the emergent family of nanohybrid Josephson junctions. Therefore caution should be applied in the use of such junctions in, for instance, the search for Majorana fermions.

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Section: Discussion and Concluding Remarksmentioning

confidence: 99%

Breakdown of the escape dynamics in Josephson junctions

Massarotti

Stornaiuolo

Lucignano³

et al. 2015

Phys. Rev. B

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“…37 The physical reason is that the phase changes in a sharply nonlinear manner with the greater part of the period being close to / 2+2n. In addition, nonequilibrium effects 38 and unconventional order parameter symmetry ͑with a not negligible second harmonic component in the current-phase Josephson relation 39 ͒ are possible additional sources of supercurrent flowing at finite voltage. Our results seem to confirm the presence of non-negligible contribution of supercurrent at large voltages from a different perspective.…”

Section: Sampling Nonlocality: Autocorrelation Versus ⌬Hmentioning

confidence: 99%

Mesoscopic conductance fluctuations inYBa2Cu3O7−δgrain boundary junctions at low tem

et al. 2009

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The magnetoconductance in YBa 2 Cu 3 O 7−␦ grain boundary Josephson junctions displays fluctuations at low temperatures of mesoscopic origin. The morphology of the junction suggests that transport occurs in narrow channels across the grain boundary line with a large Thouless energy. Nevertheless the measured fluctuation amplitude decreases quite slowly when increasing the voltage up to values about 20 times the Thouless energy, of the order of the nominal superconducting gap. Our findings show the coexistence of supercurrent and quasiparticle current in the junction conduction even at high nonequilibrium conditions. Model calculations confirm the reduced role of quasiparticle relaxation at temperatures up to 3 K.

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“…The physical reason is that the phase changes in a sharply nonlinear manner with the greater part of the period being close to π/2+2nπ. In addition, non-equilibrium effects 37 and unconventional order parameter symmetry (with a not negligible second harmonic component in the current-phase Josephson relation 38 ) are possible additional sources of supercurrent flowing at finite voltage. Our results seem to confirm the presence of non negligible contribution of supercurrent at large voltages, from a different perspective.…”

Section: Sampling Nonlocality: Autocorrelation Vs ∆Hmentioning

confidence: 99%

Mesoscopic conductance fluctuations in YBa$_2$Cu$_3$O$_{7-δ}$ grain boundary Junction at low temperature

Tagliacozzo,

Tafuri,

Gambale

et al. 2009

Preprint

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Nonequilibrium superconductivity in mesoscopic Nb/InAs/Nb junctions

Cited by 7 publications

References 19 publications

Breakdown of the escape dynamics in Josephson junctions

Breakdown of the escape dynamics in Josephson junctions

Mesoscopic conductance fluctuations inYBa2Cu3O7−δgrain boundary junctions at low tem

Mesoscopic conductance fluctuations in YBa$_2$Cu$_3$O$_{7-δ}$ grain boundary Junction at low temperature

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