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Characteristics of superconducting tungsten silicide WxSi1-x for single photon detection | | X. Zhang
; A. Engel
; Q. Wang
; A. Schilling
; A. Semenov
; M. Sidorova
; I. Charaev
; K. Ilin
; M. Siegel
; | | Date: |
26 Jul 2016 | | Abstract: | Superconducting properties of three series of amorphous WxSi1-x films with
different thickness and stoichiometry were investigated by dc transport
measurements in a magnetic field up to 9 T. These amorphous WxSi1-x films were
deposited by magnetron co-sputtering of the elemental source targets onto
silicon substrates at room temperature and patterned in form of bridges by
optical lithography and reactive ion etching. Analysis of the data on
magnetoconductivity allowed us to extract the critical temperature,
superconducting coherence length, magnetic penetration depth, and diffusion
coefficient of electrons in the normal state as a function of film thickness
for each stoichiometry. Two basic time constants were derived from transport
and time-resolving measurements. A dynamic process of the formation of a
hot-spot was analyzed in the framework of a diffusion-based vortex-entry model.
We used the two stage diffusion approach and defined a hotspot size by assuming
that the quasi-particles and normal-state electrons have the equal diffusion
constant. Our findings are consistent with the most recent results on a
hot-spot relaxation time in the WxSi1-x superconducting nanowire single-photon
detector. In the 5 nm thick W0.85Si0.15 film the hot-spot has a radius of 105
nm at the peak of the number of non-equilibrium quasi-particles. | | Source: | arXiv, 1607.7854 | | Services: | Forum | Review | PDF | Favorites | |
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