Superconducting insulators and localization of Cooper pairs

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

    Research output: Contribution to journalArticleScientificpeer-review

    6 Citations (Scopus)
    50 Downloads (Pure)

    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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