Stabilization of non-self-spreading hotspots in current- and voltage-biased superconducting NbN microstrips

Adam, Sébastien; Piraux, Luc; Michotte, Sébastien; Lucot, D.; Mailly, D.

doi:10.1088/0953-2048/22/10/105010

Cited by 7 publications

(4 citation statements)

References 18 publications

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“…The principle of operation of superconducting single photon detectors (SSPDs) are commonly based on the spread of a current assisted hotspot expected at low temperatures when phase slips become unstable. , In highlight of the previous analyses, this regime does not occur at the temperatures reached here (200 mK) that remain below the typical range of temperature for single photon detection (1–4 K).…”

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confidence: 85%

Quantum and Thermal Phase Slips in Superconducting Niobium Nitride (NbN) Ultrathin Crystalline Nanowire: Application to Single Photon Detection

et al. 2012

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We present low-temperature electronic transport properties of superconducting nanowires obtained by nanolithography of 4-nm-thick niobium nitride (NbN) films epitaxially grown on sapphire substrate. Below 6 K, clear evidence of phase slippages is observed in the transport measurements. Upon lowering the temperature, we observe the signatures of a crossover between a thermal and a quantum behavior in the phase slip regimes. We find that phase slips are stable even at the lowest temperatures and that no hotspot is formed. The photoresponse of these nanowires is measured as a function of the light irradiation wavelength and temperature and exhibits a behavior comparable with previous results obtained on thicker films.

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confidence: 85%

Quantum and Thermal Phase Slips in Superconducting Niobium Nitride (NbN) Ultrathin Crystalline Nanowire: Application to Single Photon Detection

et al. 2012

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“…In particular, the hysteresis is almost negligible if T > 0.4 • T C . In NbN nanowires the hysteresis, which also decreases when increasing the temperature [77], can instead persist up to temperatures close to T C . In our case, the narrower T /T C range in which I C > I r might be due to the smaller value of κ of YBCO with respect to that of NbN.…”

Section: Ultrathin Bare Nanowires: a Possible Platform For Ybco Singl...mentioning

confidence: 99%

Transport properties of ultrathin YBa2Cu3O7−δ nanowires: A route to single-photon detection

et al. 2017

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We report on the growth and characterization of ultrathin YBa2Cu3O 7−δ (YBCO) films on MgO (110) substrates, which exhibit superconducting properties at thicknesses down to 3 nm. YBCO nanowires, with thicknesses down to 10 nm and widths down to 65 nm, have been also successfully fabricated. The nanowires protected by a Au capping layer show superconducting properties close to the as-grown films, and critical current densities, which are only limited by vortex dynamics. The 10 nm thick YBCO nanowires without the Au capping present hysteretic current voltage characteristics, characterized by a voltage switch which drives the nanowires directly from the superconducting to the normal state. Such bistability is associated in NbN nanowires to the presence of localized normal domains within the superconductor. The presence of the voltage switch, in ultrathin nanostructures characterized by high sheet resistance values, though preserving high quality superconducting properties, make our nanowires very attractive devices to engineer single photon detectors.arXiv:1708.04721v1 [cond-mat.supr-con]

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“…The hysteresis current is defined as the smallest applied current sufficient to sustain a stable hot-spot region in a superconducting film. Its value, the shape of the current-voltage characteristics, and the temperature and geometry dependences have been the subject of many theoretical and experimental works [8][9][10][11]. It has been shown that in the case of long bridges the hysteresis current is mostly defined by a thermal resistance, or in other words by a transparency for phonon propagation through an interface between the superconducting film and the substrate.…”

Section: Introductionmentioning

confidence: 99%

Adjustment of self-heating in long superconducting thin film NbN microbridges

Stockhausen

Ilin

Siegel

et al. 2012

Supercond. Sci. Technol.

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The self-heating in long superconducting microbridges made from thin NbN films deposited on top of high silicon mesa structures was studied by analyzing the hysteresis current density jH. We observed a more than twofold decrease of jH with increase in the ratio of the height of the Si mesa, h, to the width of the microbridge, W, from 0 to 24. We describe our experimental results using one-dimensional thermal balance equations taking into account disordered matter in our thin NbN films and limitations imposed on the phonon mean free path by the width of the Si mesa. In the framework of this model we obtain a good agreement between theory and experiment over a wide temperature range from 4.2 K up to the critical temperature TC for all h/W ratios.

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Stabilization of non-self-spreading hotspots in current- and voltage-biased superconducting NbN microstrips

Cited by 7 publications

References 18 publications

Quantum and Thermal Phase Slips in Superconducting Niobium Nitride (NbN) Ultrathin Crystalline Nanowire: Application to Single Photon Detection

Quantum and Thermal Phase Slips in Superconducting Niobium Nitride (NbN) Ultrathin Crystalline Nanowire: Application to Single Photon Detection

Transport properties of ultrathin YBa2Cu3O7−δ nanowires: A route to single-photon detection

Adjustment of self-heating in long superconducting thin film NbN microbridges

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