Dependence of count rate on magnetic field in superconducting thin-film TaN single-photon detectors
Andreas Engel, Andreas Schilling, Konstantin Il'in, Michael Siegel
DOI 10.1103/PhysRevB.86.140506 · Physical Review B
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Abstract
We have studied the magnetic-field dependence of both dark-count rates and photon-count rates in a superconducting nanowire single-photon detector made of TaN in external magnetic fields |μ0H|<10 mT perpendicular to the plane of the underlying meander structure and at T=4 K. The dark-count rates show a characteristic field dependence, which is asymmetric with respect to magnetic-field direction. The field and the current dependence of the dark counts can be quantitatively well explained if one assumes that the critical current is reduced to ≈50% at the 180∘ meander turns when compared to a straight strip, and the observed asymmetry can be modeled assuming that the turnarounds are not all strictly equal. Surprisingly, the photon-count rates do not show any significant field dependence, which seems to be at odds with existing detection models invoking vortex crossings.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TaN Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.84 | Pressure not reported | unknown |
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