Superconducting insulators and localization of Cooper pairs

Konstantin Yu Arutyunov, Janne S. Lehtinen, Alexey Radkevich, Andrew G. Semenov, Andrei D. Zaikin (Corresponding Author)

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Abstract

Rapid miniaturization of electronic devices and circuits demands profound understanding of fluctuation phenomena at the nanoscale. Superconducting nanowires – serving as important building blocks for such devices – may seriously suffer from fluctuations which tend to destroy long-range order and suppress superconductivity. In particular, quantum phase slips (QPS) proliferating at low temperatures may turn a quasi-one-dimensional superconductor into a resistor or an insulator. Here, we introduce a physical concept of QPS-controlled localization of Cooper pairs that may occur even in uniform nanowires without any dielectric barriers being a fundamental manifestation of the flux-charge duality in superconductors. We demonstrate – both experimentally and theoretically – that deep in the “insulating” state such nanowires actually exhibit non-trivial superposition of superconductivity and weak Coulomb blockade of Cooper pairs generated by quantum tunneling of magnetic fluxons across the wire.

Original languageEnglish
Article number146
Number of pages7
JournalCommunications Physics
Volume4
Issue number1
DOIs
Publication statusPublished - 24 Jun 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Superconducting properties and materials
  • Superconducting devices

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