Dresden 2006 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 7: Superconductivity & Solids At Low Temperature - Poster Session

TT 7.39: Poster

Montag, 27. März 2006, 14:00–17:45, P1

Proximity effect and multiple Andreev reflections in diffusive superconductor-normal-metal-superconductor junctions — •Jan C. Hammer¹, Juan Carlos Cuevas^1,2,3, Juha Kopu^1,4, Janne K. Viljas¹, and Matthias Eschrig¹ — ¹Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany — ²Departamento de Física Teórica de la Materia Condensada, Universidad Autónoma de Madrid, 28049-Madrid, Spain — ³Forschungszentrum Karlsruhe, Institut für Nanotechnologie, 76021 Karlsruhe — ⁴Low Temperature Laboratory, Helsinki University of Technology, P.O.Box 2200, FIN-02015 HUT, Finland

We present a theory of the current-voltage characteristics in diffusive superconductor-normal-metal-superconductor junctions. By solving the time dependent Usadel equation we are able to describe the phase-coherent transport for arbitrary length of the normal wire and arbitrary temperature. We show how the interplay between proximity effect and multiple Andreev reflections gives rise to a rich subgap structure in the conductance and how it is revealed in the non-equilibrium distribution function.