Cooper-pair resonances and subgap Coulomb blockade in a superconducting single-electron transistor

We have fabricated and measured superconducting single-electron transistors with Al leads and Nb islands. At bias voltages below the gap of Nb we observe clear signatures of resonant tunneling of Cooper pairs, and of Coulomb blockade of the subgap currents due to linewidth broadening of the energy l...

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Bibliographic Details
Published inarXiv.org
Main Authors Toppari, J J, Kuhn, T, Halvari, A P, Kinnunen, J, Leskinen, M, Paraoanu, G S
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 10.12.2007
Subjects
Aluminum
Computer simulation
Cooper pairs
Electrons
Energy levels
Niobium
Quantum theory
Resonant tunneling
Semiconductor devices
Single-electron transistors
Superconductivity
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Summary:We have fabricated and measured superconducting single-electron transistors with Al leads and Nb islands. At bias voltages below the gap of Nb we observe clear signatures of resonant tunneling of Cooper pairs, and of Coulomb blockade of the subgap currents due to linewidth broadening of the energy levels in the superconducting density of states of Nb. The experimental results are in good agreement with numerical simulations.
ISSN:2331-8422
DOI:10.48550/arxiv.0311148