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Josephson radiation and shot noise of a semiconductor nanowire junction

By David J Van Woerkom, Alex Proutski, Ruben JJ Van Gulik, Tamás Kriváchy, D Diana Car, SR Sebastien Plissard, EPAM Erik Bakkers, Leo P Kouwenhoven and Attila Geresdi


\u3cp\u3eWe measured the Josephson radiation emitted by an InSb semiconductor nanowire junction utilizing photon-assisted quasiparticle tunneling in an ac-coupled superconducting tunnel junction. We quantify the action of the local microwave environment by evaluating the frequency dependence of the inelastic Cooper-pair tunneling of the nanowire junction and find the zero-frequency impedance Z(0)=492Ω with a cutoff frequency of f0=33.1GHz. We extract a circuit coupling efficiency of η≈0.1 and a detector quantum efficiency approaching unity in the high-frequency limit. In addition to the Josephson radiation, we identify a shot noise contribution with a Fano factor F≈1, consistently with the presence of single electron states in the nanowire channel.\u3c/p\u3

Publisher: 'American Physical Society (APS)'
Year: 2017
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Provided by: Repository TU/e
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