Dresden 2003 – wissenschaftliches Programm

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TT: Tiefe Temperaturen

TT 14: Postersitzung III (Neue u. unkonventionelle Supraleiter, Anwendungen der Supraleitung, Dünne Schichten, JJs und SQUIDs, Schwere Fermionen, Kondo-Systeme)

TT 14.14: Poster

Mittwoch, 26. März 2003, 14:30–19:00, P2c

Current voltage characteristics of SNS contacts in a microwave field — •Oliver Rösch and Reiner Kümmel — Institut für Theoretische Physik und Astrophysik, Julius-Maximilians-Universität Würzburg

We solve the time-dependent Bogoliubov-de Gennes equations analytically for a superconductor-normal metal-superconductor (SNS) contact, where in addition to a dc voltage bias there is also an ac voltage drop resulting from microwave irradiation. After constructing quasiparticle wave packets we calculate current voltage characteristics in a relaxation time model.

Besides Shapiro current peaks (including subharmonic ones) there appear also satellite structures to the subharmonic gap structure due to photon-assisted multiple Andreev reflections. Compared to other approaches [1,2], a finite normal layer width and the resulting retardation effects are taken account of explicitly.
U. Gunsenheimer and A. D. Zaikin, Europhys. Lett. 41, 195 (1998)
J. C. Cuevas et al., Phys. Rev. Lett. 88, 157001 (2002)