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6 Feb 2012

Volume 100, Issue 6, Articles (06xxxx)

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Appl. Phys. Lett. 100, 061101 (2012); http://dx.doi.org/10.1063/1.3665180 (3 pages)

I. E. Khodasevych, C. M. Shah, S. Sriram, M. Bhaskaran, W. Withayachumnankul, B. S. Y. Ung, H. Lin, W. S. T. Rowe, D. Abbott, and A. Mitchell
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Tantalum nitride superconducting single-photon detectors with low cut-off energy

A. Engel, A. Aeschbacher, K. Inderbitzin, A. Schilling, K. Il’in, M. Hofherr, M. Siegel, A. Semenov, and H.-W. Hübers

Appl. Phys. Lett. 100, 062601 (2012); http://dx.doi.org/10.1063/1.3684243 (3 pages) | Cited 6 times

Online Publication Date: 10 February 2012

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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 ≈1/3 as compared to NbN.
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74.25.Jb Electronic structure (photoemission, etc.)
73.21.Hb Quantum wires
73.20.At Surface states, band structure, electron density of states
74.70.-b Superconducting materials other than cuprates
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