Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tantalum nitride superconducting single-photon detectors with low
  cut-off energy   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.

34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex