Quantum Phase Slip as a Dual Process to Josephson Tunneling

K. Yu Arutyunov, J. S. Lehtinen

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

Abstract

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. Fundamental attributes of superconductivity such as zero resistivity, persistent currents in closed loops, energy gap in excitation spectra can be drastically violated by fluctuations. Here we report the experimental study of I-V characteristics of thin superconducting titanium nanowires governed by quantum phase slips. The thinnest samples imbedded in high-ohmic environment demonstrated counterintuitive behavior for a superconductor: Coulomb blockade. The magnitude of the Coulomb gap correlates with the rate of quantum phase slips. The observation confirms the similarity of quantum charge dynamics in a Josephson junction and in a quasi-one-dimensional superconducting channel governed by quantum fluctuations of the order parameter.

Original languageEnglish
Article number012003
JournalJournal of Physics: Conference Series
Volume1190
Issue number1
DOIs
Publication statusPublished - 23 May 2019
MoE publication typeA4 Article in a conference publication
Event19th International Conference on Extended Defects in Semiconductors, EDS 2018 - Thessaloniki, Greece
Duration: 24 Jun 201829 Jun 2018

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Josephson effect
slip
nanowires
Josephson junctions
superconductivity
titanium
electrical resistivity
excitation

Cite this

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Quantum Phase Slip as a Dual Process to Josephson Tunneling. / Arutyunov, K. Yu; Lehtinen, J. S.

In: Journal of Physics: Conference Series, Vol. 1190, No. 1, 012003, 23.05.2019.

Research output: Contribution to journalArticle in a proceedings journalScientificpeer-review

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AU - Lehtinen, J. S.

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