Josephson radiation and shot noise of a semiconductor nanowire junction

David J. Van Woerkom; Alex Proutski; Ruben J.J. Van Gulik; Tamás Kriváchy; Diana Car; Sébastian R. Plissard; Erik P.A.M. Bakkers; Leo P. Kouwenhoven; Attila Geresdi

doi:10.1103/PhysRevB.96.094508

Josephson radiation and shot noise of a semiconductor nanowire junction

David J. Van Woerkom, Alex Proutski, Ruben J.J. Van Gulik, Tamás Kriváchy, Diana Car, Sébastian R. Plissard, Erik P.A.M. Bakkers, Leo P. Kouwenhoven, Attila Geresdi^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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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.

Original language	English
Article number	094508
Journal	Physical Review B
Volume	96
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevB.96.094508
Publication status	Published - 11 Sept 2017

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title = "Josephson radiation and shot noise of a semiconductor nanowire junction",

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.",

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AU - Van Woerkom, David J.

AU - Proutski, Alex

AU - Van Gulik, Ruben J.J.

AU - Kriváchy, Tamás

AU - Car, Diana

AU - Plissard, Sébastian R.

AU - Bakkers, Erik P.A.M.

AU - Kouwenhoven, Leo P.

AU - Geresdi, Attila

PY - 2017/9/11

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AB - 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.

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Josephson radiation and shot noise of a semiconductor nanowire junction

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