Tantalum nitride superconducting single-photon detectors with low cut-off energy

Details Tantalum nitride superconducting single-photon detectors with low cut-off energy Tantalum nitride superconducting single-photon detectors with low cut-off energy

2011-10-20

arxiv.org/abs/1110.4576v3

Appl. Phys. Lett., Vol 100, 062601 (2012)

Physics

Condensed Matter

Superconductivity

9 pages incl. 1 table and 2 figures; corrected typos in table 1

Scientific paper

10.1063/1.3684243

Materials with a small superconducting energy gap are expected to favor a high detection efficiency of low-energy photons in superconducting nanowire single-photon detectors. We developed a TaN detector with smaller gap and lower density of states at the Fermi energy than in comparable NbN devices, while other relevant parameters remain essentially unchanged. The observed reduction of the minimum photon energy required for direct detection is in line with model predictions of $\approx1/3$ as compared to NbN.

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