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12 Mar 2012

Volume 100, Issue 11, Articles (11xxxx)

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Appl. Phys. Lett. 100, 111101 (2012); http://dx.doi.org/10.1063/1.3691957 (3 pages)

Christina Alpmann, Michael Esseling, Patrick Rose, and Cornelia Denz
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Afterpulsing and instability in superconducting nanowire avalanche photodetectors

F. Marsili, F. Najafi, E. Dauler, R. J. Molnar, and K. K. Berggren

Appl. Phys. Lett. 100, 112601 (2012); http://dx.doi.org/10.1063/1.3691944 (5 pages) | Cited 6 times

Online Publication Date: 13 March 2012

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We investigated the reset time of superconducting nanowire avalanche photodetectors (SNAPs) based on 30 nm wide nanowires. We studied the dependence of the reset time of SNAPs on the device inductance and discovered that SNAPs can provide a speed-up relative to superconducting nanowire single-photon detectors with the same area but with some limitations: (1) Reducing the series inductance of SNAPs (necessary for the avalanche formation) could result in the detectors operating in an unstable regime, (2) a trade-off exists between maximizing the bias current margin and minimizing the reset time of SNAPs, and (3) reducing the reset time of SNAPs below ∼1 ns resulted in afterpulsing.
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85.25.Oj Superconducting optical, X-ray, and γ-ray detectors (SIS, NIS, transition edge)
07.57.Kp Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors

Superconducting wire subject to synchronous oscillating excitations: Power dissipation, magnetic response, and low-pass filtering

H. S. Ruiz, A. Badía-Majós, Y. A. Genenko, H. Rauh, and S. V. Yampolskii

Appl. Phys. Lett. 100, 112602 (2012); http://dx.doi.org/10.1063/1.3693614 (5 pages) | Cited 1 time

Online Publication Date: 15 March 2012

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Numerical simulations of a type-II superconducting wire subject to an ac transport current and oscillating transverse magnetic field are performed using the theory of the critical state. Time-dependent distributions of the current and the density of magnetic flux, the local power dissipation, and cycles of the magnetic moment are displayed. Noticeable inhomogeneous dissipation and field distortions are exposed. Results for hysteretic ac losses are reported too, and significant differences to predictions of available approximate formulae identified. Finally, a distinct low-pass filtering effect intrinsic to the wire’s magnetic response is revealed.
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74.25.Sv Critical currents
75.30.Cr Saturation moments and magnetic susceptibilities
02.60.-x Numerical approximation and analysis
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