Quantum and Thermal Phase Slips in Superconducting Niobium Nitride (NbN) Ultrathin Crystalline Nanowire: Application to Single Photon Detection
2012
We present low-temperature electronic transport properties of superconducting nanowires obtained by
nanolithographyof 4-nm-thick
niobium nitride(NbN) films epitaxially grown on sapphire substrate. Below 6 K, clear evidence of phase
slippagesis observed in the transport measurements. Upon lowering the temperature, we observe the signatures of a crossover between a thermal and a quantum behavior in the phase slip regimes. We find that phase slips are stable even at the lowest temperatures and that no hotspot is formed. The photoresponse of these nanowires is measured as a function of the light irradiation wavelength and temperature and exhibits a behavior comparable with previous results obtained on thicker films.
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