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Shot Noise in Ultrathin Superconducting Wires

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Abstract

Quantum phase slips (QPS) may produce non-equilibrium voltage fluctuations in current-biased superconducting nanowires. Making use of the Keldysh technique and employing the phase-charge duality arguments we investigate such fluctuations within the four-point measurement scheme and demonstrate that shot noise of the voltage detected in such nanowires may essentially depend on the particular measurement setup. In long wires, the shot noise power decreases with increasing frequency Ω and vanishes beyond a threshold value of Ω at T→0.

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Acknowledgments

This work was supported in part by the RFBR grant no. 15-02-08273. It has been presented at the International Conference SUPERSTRIPES 2016 [12].

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Authors and Affiliations

  1. I.E.Tamm Department of Theoretical Physics, P.N.Lebedev Physics Institute, 119991, Moscow, Russia

    Andrew G. Semenov & Andrei D. Zaikin

  2. National Research University Higher School of Economics, 101000, Moscow, Russia

    Andrew G. Semenov

  3. Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76021, Karlsruhe, Germany

    Andrei D. Zaikin

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  1. Andrew G. Semenov
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  2. Andrei D. Zaikin
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Correspondence to Andrew G. Semenov.

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Semenov, A.G., Zaikin, A.D. Shot Noise in Ultrathin Superconducting Wires. J Supercond Nov Magn 30, 139–143 (2017). https://doi.org/10.1007/s10948-016-3783-9

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  • DOI: https://doi.org/10.1007/s10948-016-3783-9

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