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

doi:10.1134/S1063783417110051

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 journal › Article › Scientific › peer-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 language	English
Pages (from-to)	2110-2113
Number of pages	4
Journal	Physics of the Solid State
Volume	59
Issue number	11
DOIs	https://doi.org/10.1134/S1063783417110051
Publication status	Published - 1 Nov 2017
MoE publication type	A1 Journal article-refereed

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Arutyunov, K. Y., Lehtinen, J. S., Radkevich, A. A., Semenov, A. G., & Zaikin, A. D. (2017). Density of states of narrow superconducting channels in the regime of quantum fluctuations of the order parameter. Physics of the Solid State, 59(11), 2110-2113. https://doi.org/10.1134/S1063783417110051

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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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AU - Lehtinen, J. S.

AU - Radkevich, A. A.

AU - Semenov, A. G.

AU - Zaikin, A. D.

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