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

C. Benjamin (), T. Jonckheere (), A. Zazunov and T. Martin

The European Physical Journal B: Condensed Matter and Complex Systems, 2007, vol. 57, issue 3, 279-289

Abstract: 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. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Keywords: 74.50.+r Tunneling phenomena; point contacts, weak links, Josephson effects, 74.78.Na Mesoscopic and nanoscale systems, 85.25.-j Superconducting devices , (search for similar items in EconPapers)
Date: 2007
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DOI: 10.1140/epjb/e2007-00167-6

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