Print Email Facebook Twitter Josephson radiation and shot noise of a semiconductor nanowire junction Title Josephson radiation and shot noise of a semiconductor nanowire junction Author van Woerkom, D.J. (TU Delft QRD/Kouwenhoven Lab) Proutski, A. (TU Delft QRD/Kouwenhoven Lab) van Gulik, R.J.J. (TU Delft QRD/Kouwenhoven Lab; TU Delft QN/Quantum Transport) Kriváchy, Tamás Car, D. (Eindhoven University of Technology) Plissard, S.R. (Eindhoven University of Technology) Bakkers, E.P.A.M. (TU Delft QN/Bakkers Lab; Eindhoven University of Technology) Kouwenhoven, Leo P. (TU Delft QRD/Kouwenhoven Lab) Geresdi, A. (TU Delft QRD/Geresdi Lab) Date 2017-09-11 Abstract We 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. To reference this document use: http://resolver.tudelft.nl/uuid:0aa4344a-7b25-4722-a9a4-4fd678f783d3 DOI https://doi.org/10.1103/PhysRevB.96.094508 ISSN 2160-3308 Source Physical Review B, 96 (9) Part of collection Institutional Repository Document type journal article Rights © 2017 D.J. van Woerkom, A. Proutski, R.J.J. van Gulik, Tamás Kriváchy, D. Car, S.R. Plissard, E.P.A.M. Bakkers, Leo P. Kouwenhoven, A. Geresdi Files PDF PhysRevB.96.094508_1.pdf 595.18 KB Close viewer /islandora/object/uuid:0aa4344a-7b25-4722-a9a4-4fd678f783d3/datastream/OBJ/view