Density of states of narrow superconducting channels in the regime of quantum fluctuations of the order parameter

K. Yu Arutyunov, J. S. Lehtinen, A. A. Radkevich, A. G. Semenov, A. D. Zaikin

    Research output: Contribution to journalArticleScientificpeer-review

    3 Citations (Scopus)

    Abstract

    The current–voltage characteristics of superconductor–insulator–semiconductor (S1–I–S2) tunnel junctions, where superconducting electrode S2 is a thin nanowire, are studied experimentally. The observed blurring of the gap singularities is interpreted as a manifestation of the order parameter quantum fluctuations. We propose a model taking into account the broadening of the density of states due to the interaction of electrons with the Mooij–Schön plasmon mode emerging in a quasi-one-dimensional superconducting channel in the regime of quantum fluctuations of the order parameter. The model gives results that are in a reasonable qualitative agreement with the experimental data.

    Original languageEnglish
    Pages (from-to)2110-2113
    Number of pages4
    JournalPhysics of the Solid State
    Volume59
    Issue number11
    DOIs
    Publication statusPublished - 1 Nov 2017
    MoE publication typeA1 Journal article-refereed

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    Tunnel junctions
    blurring
    tunnel junctions
    Nanowires
    emerging
    nanowires
    Electrodes
    electrodes
    Electrons
    electrons
    interactions

    Cite this

    Arutyunov, K. Yu ; Lehtinen, J. S. ; Radkevich, A. A. ; Semenov, A. G. ; Zaikin, A. D. / Density of states of narrow superconducting channels in the regime of quantum fluctuations of the order parameter. In: Physics of the Solid State. 2017 ; Vol. 59, No. 11. pp. 2110-2113.
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    abstract = "The current–voltage characteristics of superconductor–insulator–semiconductor (S1–I–S2) tunnel junctions, where superconducting electrode S2 is a thin nanowire, are studied experimentally. The observed blurring of the gap singularities is interpreted as a manifestation of the order parameter quantum fluctuations. We propose a model taking into account the broadening of the density of states due to the interaction of electrons with the Mooij–Sch{\"o}n plasmon mode emerging in a quasi-one-dimensional superconducting channel in the regime of quantum fluctuations of the order parameter. The model gives results that are in a reasonable qualitative agreement with the experimental data.",
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    Density of states of narrow superconducting channels in the regime of quantum fluctuations of the order parameter. / Arutyunov, K. Yu; Lehtinen, J. S.; Radkevich, A. A.; Semenov, A. G.; Zaikin, A. D.

    In: Physics of the Solid State, Vol. 59, No. 11, 01.11.2017, p. 2110-2113.

    Research output: Contribution to journalArticleScientificpeer-review

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    AU - Arutyunov, K. Yu

    AU - Lehtinen, J. S.

    AU - Radkevich, A. A.

    AU - Semenov, A. G.

    AU - Zaikin, A. D.

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    AB - The current–voltage characteristics of superconductor–insulator–semiconductor (S1–I–S2) tunnel junctions, where superconducting electrode S2 is a thin nanowire, are studied experimentally. The observed blurring of the gap singularities is interpreted as a manifestation of the order parameter quantum fluctuations. We propose a model taking into account the broadening of the density of states due to the interaction of electrons with the Mooij–Schön plasmon mode emerging in a quasi-one-dimensional superconducting channel in the regime of quantum fluctuations of the order parameter. The model gives results that are in a reasonable qualitative agreement with the experimental data.

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