Konstantin Arutyunov
(National Research University Higher School of Economics, Moscow Institute of Electronics and Mathematics, 101000, Moscow, Russia; P.L. Kapitza Institute for Physical Problems RAS, 119334, Moscow, Russia.)
Superconducting properties of metallic nanowires can be entirely different from those of bulk superconductors because of the dominating role played by thermal and quantum fluctuations of the order parameter [1]. Fundamental attributes of superconductivity such as zero resistivity, persistent currents in closed loops, energy gap in excitation spectra can be drastically violated by fluctuations. Quasi-one-dimensional superconducting channels host sound-like plasma modes propagating along the sample which are associated with fluctuations of the phase of the superconducting order parameter [2]. Interaction between these electromagnetic excitations and charge carriers affects the electron density of states (DOS) [3]. Here we report the experimental study of I-V characteristics of tunnel S1-I-S2 junctions, where superconducting S2 electrode is a thin nanowire in the regime of quantum fluctuations. The observed broadening of the I-V dependencies at the gap edge is interpreted as the renormalization of DOS. The results are in reasonable agreement with the model [3], taking into consideration plasma modes in quasi-one-dimensional superconductors.
[1] Arutyunov K. Yu., Golubev D. S. , Zaikin A. D. 2008 Physics Reports 464 1.
[2] Mooij J.E. and G. Schön, 1985 Phys. Rev. Lett. 55 114.
[3] Radkevich A. A., Semenov A. G., Zaikin A. D. 2017 Phys. Rev. B 96 085435.
Konstantin Arutyunov
(National Research University Higher School of Economics, Moscow Institute of Electronics and Mathematics, 101000, Moscow, Russia; P.L. Kapitza Institute for Physical Problems RAS, 119334, Moscow, Russia.)
J.S. Lehtinen
(VTT Technical Research Centre of Finland Ltd., Centre for Metrology MIKES, P.O. Box 1000, FI-02044 VTT, Finland)
A.A. Radkevich
(Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, 141701,Russia; I.E. Tamm Department of Theoretical Physics, P.N. Lebedev Physical Institute, 119991 Moscow, Russia)
A.G. Semenov
(National Research University Higher School of Economics, Moscow Institute of Electronics and Mathematics, 101000, Moscow, Russia; Moscow Institute of Physics and Technology, Dolgoprudny, Moscow Region, 141701,Russia; I.E. Tamm Department of Theoretical Physics, P.N. Lebedev Physical Institute, 119991 Moscow, Russia )
A.D. Zaikin
(National Research University Higher School of Economics, Moscow Institute of Electronics and Mathematics, 101000, Moscow, Russia; I.E. Tamm Department of Theoretical Physics, P.N. Lebedev Physical Institute, 119991 Moscow, Russia; Institute of Nanotechnology, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany)
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