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

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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–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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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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author = "Arutyunov, {K. Yu} and Lehtinen, {J. S.} and Radkevich, {A. A.} and Semenov, {A. G.} and Zaikin, {A. D.}",

note = "Funding Information: This communication contains the results of studies carried out under the project TZ-89 “Quantum cooperative phenomena at low and ultralow temperatures” within the framework of the Basic Research Program at the National Research University Higher School of Economics (HSE) and supported by the Russian Academic Excellence Project 5-100. Publisher Copyright: {\textcopyright} 2017, Pleiades Publishing, Ltd. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.",

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T1 - Density of states of narrow superconducting channels in the regime of quantum fluctuations of the order parameter

AU - Arutyunov, K. Yu

AU - Lehtinen, J. S.

AU - Radkevich, A. A.

AU - Semenov, A. G.

AU - Zaikin, A. D.

N1 - Funding Information: This communication contains the results of studies carried out under the project TZ-89 “Quantum cooperative phenomena at low and ultralow temperatures” within the framework of the Basic Research Program at the National Research University Higher School of Economics (HSE) and supported by the Russian Academic Excellence Project 5-100. Publisher Copyright: © 2017, Pleiades Publishing, Ltd. Copyright: Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2017/11/1

Y1 - 2017/11/1

N2 - 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.

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

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