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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.
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.
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.
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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