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Regular version of the site

Article

Density of States of Narrow Superconducting Channels in the Regime of Quantum Fluctuations of the Order Parameter

Physics of the Solid State. 2017. Vol. 59. No. 11. P. 2110-2113.
K. Yu. Arutyunov, Lehtinen J. S., Radkevich A. A., Semenov A. G., Zaikin A. D.

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.