Dissipation in ultra-thin current-carrying superconducting bridges; evidence for quantum tunneling of Pearl vortices

Tafuri, F.; Kirtley, J. R.; Born, D.; Stornaiuolo, Daniela; Medaglia, P. G.; Orgiani, P.; Balestrino, G.; Kogan, V. G.

doi:10.1209/epl/i2005-10485-3

Cited by 44 publications

(36 citation statements)

References 17 publications

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“…A detailed statistical analysis suggests that at temperatures T 2 K dark counts may not be thermally activated, but caused by quantum-mechanical tunneling events, so called QPS. Quantum tunneling of vortices through the edge barrier was claimed previously [71] and certainly deserves further investigations. A possible dependence of the dark-count rate on the thermal coupling of SNSPDs to the thermal bath has been observed by Hofherr et al [72].…”

Section: Dark Countsmentioning

confidence: 60%

Detection mechanism of superconducting nanowire single-photon detectors

Engel¹,

Renema²,

Ilin³

et al. 2015

Supercond. Sci. Technol.

139

111

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Abstract. In this paper we intend to give a comprehensive description of the current understanding of the detection mechanism in superconducting nanowire singlephoton detectors. We will review key experimental results related to the detection mechanism, e.g. the variations of the detection probability as a function of bias current, temperature or magnetic field. Commonly used detection models will be introduced and we will analyze their predictions in view of the experimental observations. Although none of the proposed detection models is able to describe all experimental data, it is becoming increasingly clear that vortices are essential for the formation of the initial normal-conducting domain that triggers a detection event.

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Section: Dark Countsmentioning

confidence: 60%

Detection mechanism of superconducting nanowire single-photon detectors

Engel¹,

Renema²,

Ilin³

et al. 2015

Supercond. Sci. Technol.

139

111

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“…Without lengthy yet straightforward derivations, here we present the analytical expressions for both the PSS solution in the extended LAMH theory and the PSVAP solution based on the London theory [28][29][30] for DCSCs in the presence of external magnetic field and transport current, both applied along the cylindrical axis. Mathematically, a hollow cylinder of radius R is transformed into a 2D strip of width w =2R with PBC applied in the transverse y direction, as illustrated in Fig.…”

Section: Appendixmentioning

confidence: 99%

Numerical study of the phase slips in ultrathin doubly connected superconducting cylinders

Qiu

Qian

2009

Phys. Rev. B

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In the framework of Ginzburg-Landau theory, we numerically investigate the thermally activated phase slips which are responsible for the current dissipation in ultrathin doubly connected superconducting cylinders in the presence of transport current and external magnetic field along the cylinder axis. A hollow cylinder of radius R is mathematically transformed into a two-dimensional ͑2D͒ superconducting strip of width w =2R with periodic boundary condition. The phase slips may occur via free-energy saddle points of two distinct kinds. The saddle points of the first kind exhibit a one-dimensional ͑1D͒ variation of order parameter described by the ͑extended͒ Langer-Ambegaokar-McCumber-Halperin ͑LAMH͒ theory ͓Phys. Rev. 164, 498 ͑1967͒; Phys. Rev. B 1, 1054 ͑1970͔͒. The saddle points of the second kind exhibit a 2D variation of order parameter, showing that each phase slip is realized through a thermally activated process of vortex-antivortex pair creation and annihilation. In particular, there exists a critical radius R c separating the 1D LAMH behavior ͑below R c ͒ and the 2D vortex-antivortex behavior ͑above R c ͒. The effects of external magnetic field on these saddle points are presented. The critical radius R c is found to decrease with increasing field strength, and hence applying a magnetic field may induce a transition in the phase-slip characteristics.

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“…Specifically, in a thin strip with a width less than the magnetic penetration depth, the depairing current may be reached if magnetic vortices cannot enter the strip. Although a potential barrier exists that hampers permanent vortex entry 7 , there is a non-zero thermodynamic probability that a vortex will be thermally excited over the barrier and appears in the strip 8 . In this case the Lorentz force caused by the current will steer the vortex to either side of the strip.…”

Section: Introductionmentioning

confidence: 99%

Geometry-induced reduction of the critical current in superconducting nanowires

et al. 2012

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Reduction of the critical current in narrow superconducting NbN lines with sharp and rounded bends with respect to the critical current in straight lines was studied at different temperatures. We compare our experimental results with the reduction expected in the framework of the London model and the Ginsburg-Landau model. We have experimentally found that the reduction is significantly less than either model predicts. We also show that in our NbN lines the bends mostly contribute to the reduction of the critical current at temperatures well below the superconducting transition temperature.

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Dissipation in ultra-thin current-carrying superconducting bridges; evidence for quantum tunneling of Pearl vortices

Cited by 44 publications

References 17 publications

Detection mechanism of superconducting nanowire single-photon detectors

Detection mechanism of superconducting nanowire single-photon detectors

Numerical study of the phase slips in ultrathin doubly connected superconducting cylinders

Geometry-induced reduction of the critical current in superconducting nanowires

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