Junctionless Cooper pair transistor

Konstantin Yu. Arutyunov (Corresponding Author), Janne S. Lehtinen

    Research output: Contribution to journalArticleScientificpeer-review

    7 Citations (Scopus)


    Quantum phase slip (QPS) is the topological singularity of the complex order parameter of a quasi-one-dimensional superconductor: momentary zeroing of the modulus and simultaneous 'slip' of the phase by ±2π. p. The QPS event(s) are the dynamic equivalent of tunneling through a conventional Josephson junction containing static in space and time weak link(s). Here we demonstrate the operation of a superconducting single electron transistor (Cooper pair transistor) without any tunnel junctions. Instead a pair of thin superconducting titanium wires in QPS regime was used. The current-voltage characteristics demonstrate the clear Coulomb blockade with magnitude of the Coulomb gap modulated by the gate potential. The Coulomb blockade disappears above the critical temperature, and at low temperatures can be suppressed by strong magnetic field.
    Original languageEnglish
    Pages (from-to)158-160
    JournalPhysica C: Superconductivity and its Applications
    Publication statusPublished - 15 Feb 2017
    MoE publication typeA1 Journal article-refereed


    • quasi-one-dimensional superconductivity
    • quantum phase slip
    • coulomb blockade
    • OtaNano


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