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Spatially dependent sensitivity of superconducting meanders as single-photon detectors
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View: Figures


Image of FIG. 1.
FIG. 1.

The model system: a superconducting stripe (width w, length L, and thickness ) with a 90° turn. The current is applied via normal-metal contacts and the voltage is measured at a small distance away from these leads. Impact of a photon is modeled by a hotspot with radius R. Arrows indicate the supercurrent distribution.

Image of FIG. 2.
FIG. 2.

I–V characteristics of the sample of size L = 400 nm and width w = 110 nm (solid black curve) and w = 160 nm (dashed red curve) at T = 0.9 Tc . Panels (1-4) show the snapshots of the Cooper-pair density and panels (1′, 2′) the supercurrent density for the values of the applied current indicated in the main panel.

Image of FIG. 3.
FIG. 3.

Voltage vs. time characteristics of the sample (of size L = 400 nm and w = 110 nm) at T = 0.9 Tc for different applied currents. A single-photon (with pulse duration Δt = 25 ps (shaded area in (a)) and spot radius R = 15 nm) acts: (a) in the middle of the stripe, c.f. panel 1 or (b) near the inner corner, c.f. panel 4. Panels 1-7 show snapshots of (zoomed at the part of interest) at times indicated on the V(t) curves. Arrows in panel 2 show the direction of motion of the unbinding vortex-antivortex pair.

Image of FIG. 4.
FIG. 4.

Phase diagram: voltage response of the sample of Fig. 3 as a function of the location of the photon absorption for two values of the applied current: (a) j = 0.373 j 0 and (b) j = 0.383 j 0.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Spatially dependent sensitivity of superconducting meanders as single-photon detectors