Dissipative Josephson effect in S/N/S structure with vanishingly weak Josephson coupling

Volkov, A. N.; Павловский, В.

doi:10.1134/1.567280

Cited by 23 publications

(26 citation statements)

References 15 publications

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“…The existence of such Josephson-like regime without real Josephson current has been first pointed out for a 4-terminal SNS junction with opaque interfaces. 6 To understand this phenomenon, it is important to remember that the injection current in NS interferometers is not uniquely determined by the bias voltage, but also depends on the superconducting phase. In principle, a similar regime with zero voltage drop across the junction may appear even for normal reservoirs, at the transport current j T = j V (V )/2.…”

Section: Critical Current In Current Biased Junctionmentioning

confidence: 99%

“…4,5 The interferometer effect gives rise to a number of so called Josephson-like effects. 6,7 The interferometer effect has received the most of attentions; it has been extensively studied experimentally 1,8 and theoretically, 1,2,9 and presently this effect is rather well understood. The proximity of the superconducting reservoirs leads to a modification of the density of states and transport properties of the normal bridge (proximity effect), which therefore become sensitive to the phase difference at the reservoirs, and exhibit oscillating behavior as the function of the phase difference.…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon has been earlier noticed in the absence of true Josephson current in the weak proximity regime. 6 The structure of the paper is the following. After introducing a basic formalism in Section II, we discuss the spectral functions in Section III, and the distribution functions in Section IV.…”

Section: Introductionmentioning

confidence: 99%

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Nonequilibrium Josephson effect in short-arm diffusive SNS interferometers

2003

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We study non-equilibrium Josephson effect and phase-dependent conductance in three-terminal diffusive interferometers with short arms. We consider strong proximity effect and investigate an interplay of dissipative and Josephson currents co-existing within the same proximity region. In junctions with transparent interfaces, the suppression of the Josephson current appears at rather large voltage, eV ∼ ∆, and the current vanishes at eV ≥ ∆. Josephson current inversion becomes possible in junctions with resistive interfaces, where it occurs within a finite interval of the applied voltage. Due to the presence of considerably large and phase-dependent injection current, the critical current measured in a current biased junction does not coincide with the maximum Josephson current, and remains finite when the true Josephson current is suppressed. The voltage dependence of the conductance shows two pronounced peaks, at the bulk gap energy, and at the proximity gap energy; the phase oscillation of the conductance exhibits qualitatively different form at small voltage eV < ∆, and at large voltage eV > ∆.

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Section: Critical Current In Current Biased Junctionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nonequilibrium Josephson effect in short-arm diffusive SNS interferometers

2003

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“…In addition, as shown in Refs. [5,14], the measured critical current I m depends on the geometry of a particular structure and instead of decreasing may also increase with increasing voltage V . In particular one can observe Josephson-like effects (plateau on the I 3 (V S ) curve, oscillations of the measured critical current I m in a magnetic field etc) even if the Josephson coupling between superconductors under equilibrium conditions is negligable.…”

mentioning

confidence: 99%

Suppression and enhancement of the critical current in multiterminal superconductor–normal-metal–superconductor mesoscopic structures

Seviour

Volkov

2000

Phys. Rev. B

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We analyse the measured critical current Im in a mesoscopic 4-terminal S/N/S structure. The current through the S/N interface is shown to consist not only of the Josephson component Ic sin ϕ, but also a phase-coherent part Isg cos ϕ of the subgap current. The current Im is determined by the both components Ic and Isg, and depends in a nonmonotonic way on the voltage V between superconductors and normal reservoirs reaching a maximum at V ∼ = ∆/e. The obtained theoretical resultas are in qualitative agreement with recent experimental data.Recent achievements in nanotechnology have revived interest in the study of nonequilibrium and phase-coherent phenomena in superconductor-normal metal (S/N) structures. One of the most remarkable, discovered recently [1], was the observation of the sign reversal of the Josephson critical current I c (the so-called π-junction) in a multiterminal mesoscopic Nb/Au/Nb structure under nonequilibrium conditions. By passing an additional current through the N layer or, in another words, by applying a voltage V to the normal reservoirs (see Fig.1) with respect to the superconductors, one can create a nonequlibrium electron-hole distribution, or at least one can shift this distribution with respect to the electron-hole distribution in the superconductors. Under this condition, the critical current I c decreases with V and changes sign at a certain value of the applied voltage V . This effect was predicted first in Ref.[2] where a ballistic 3-terminal structure was considered (for more details, see also Refs. [3,4]). In diffusive 4-terminal S/N/S structures, the sign-reversal effect has been considered in Refs. [5][6][7] (see also [8,9]). The sign-reversal effect and switching of the π-junction into a state where ϕ = π has much in common with an instability of an uniform superconductor with a nonequilibrium distribution function [10,11].In multi-terminal S/N/S structures one can observe not only the sign reversal effect, but also a number of other interesting phenomena. For example, the conductance of a normal wire between N reservoirs oscillates with varying phase difference ϕ (see review articles [12,13]). In addition, as shown in Refs. [5,14], the measured critical current I m depends on the geometry of a particular structure and instead of decreasing may also increase with increasing voltage V . In particular one can observe Josephson-like effects (plateau on the I 3 (V S ) curve, oscillations of the measured critical current I m in a magnetic field etc) even if the Josephson coupling between superconductors under equilibrium conditions is negligable. The reason for these effects is that the current I m in a multi-terminal S/N/S structure is determined not only by the Josephson component I c sin ϕ, but also by the phase-dependent subgap current I sg cos ϕ through the S/N interface. Therefore even in the case of a small I c , the current I m can be altered by varying the phase φ. An increase of the critical current was observed in the recent paper [15] where a mesoscopic three-terminal ...

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“…Although their work is not explicitly directed towards devices with electrode separations larger than the coherence length, that case is implicitly contained in their work. More recently, the case L > ξ n has drawn some attention by others, 28,29 but in a form that does not lend itself readily to a comparison with experimental data on ballistic devices. In fact, none of the theoretical papers cited make significant contact with experiment.…”

Section: Introductionmentioning

confidence: 99%

Current-voltage characteristics of semiconductor-coupled superconducting weak links with large electrode separations

et al. 1998

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We have studied the current-voltage characteristics of superconducting weak links in which the coupling medium is the 2-D electron gas in InAs-based semiconductor quantum wells, with relatively large (typically 0.5µm) separations between niobium electrodes. The devices exhibit Josephson-like current-voltage characteristics; however, the falloff of the differential resistance with decreasing temperature is thermally activated, and is orders of magnitude slower than for more conventional weak links. Most unexpectedly, the thermal activation energies are found to be proportional to the width of the device, taken perpendicular to the current flow. This behavior falls outside the range of established theories; we propose that it is a fluctuation effect caused by giant shot noise associated with multiple Andreev reflections. The possibility of non-equilibrium effects is discussed.

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Dissipative Josephson effect in S/N/S structure with vanishingly weak Josephson coupling

Cited by 23 publications

References 15 publications

Nonequilibrium Josephson effect in short-arm diffusive SNS interferometers

Nonequilibrium Josephson effect in short-arm diffusive SNS interferometers

Suppression and enhancement of the critical current in multiterminal superconductor–normal-metal–superconductor mesoscopic structures

Current-voltage characteristics of semiconductor-coupled superconducting weak links with large electrode separations

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