The European Physical Journal B

, Volume 57, Issue 3, pp 279–289 | Cite as

Controllable π junction in a Josephson quantum-dot device with molecular spin

  • C. Benjamin
  • T. Jonckheere
  • A. Zazunov
  • T. Martin
Mesoscopic and Nanoscale Systems


We consider a model for a single molecule with a large frozen spin sandwiched in between two BCS superconductors at equilibrium, and show that this system has a π junction behavior at low temperature. The π shift can be reversed by varying the other parameters of the system, e.g., temperature or the position of the quantum dot level, implying a controllable π junction with novel application as a Josephson current switch. We show that the mechanism leading to the π shift can be explained simply in terms of the contributions of the Andreev bound states and of the continuum of states above the superconducting gap. The free energy for certain configuration of parameters shows a bistable nature, which is a necessary pre-condition for achievement of a qubit.


74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects 74.78.Na Mesoscopic and nanoscale systems 85.25.-j Superconducting devices  


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Copyright information

© EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Authors and Affiliations

  • C. Benjamin
    • 1
  • T. Jonckheere
    • 1
  • A. Zazunov
    • 1
    • 2
  • T. Martin
    • 1
    • 3
  1. 1.Centre de Physique Théorique (Centre de Physique Théorique is UMR 6207 du CNRS, associated with Université de la Méditérannée, Université de Provence, and Université de Toulon)Marseille Cedex 9France
  2. 2.LEPES, 25 Avenue des MartyrsGrenobleFrance
  3. 3.Université de la MéditérannéeMarseille Cedex 9France

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