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Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 31: SC: Tunnelling, Josephson Junctions

TT 31.10: Talk

Thursday, March 25, 2010, 12:00–12:15, H21

Analytical calculation of the excess current in the Octavio-Tinkham-Blonder-Klapwijk theory — •Gabriel Niebler1,2, Gianaurelio Cuniberti2, and Tomáš Novotný11Department of Condensed Matter Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic — 2Institute for Materials Science and Max Bergmann Center of Biomaterials, Dresden University of Technology, D-01062 Dresden, Germany

We present an analytical derivation of the excess current in Josephson junctions within the Octavio-Tinkham-Blonder-Klapwijk theory for both symmetric and asymmetric barrier strengths. We confirm the result found numerically by Flensberg et al. for equal barriers [Physical Review B 38, 8707 (1988)], including the prediction of negative excess current for low transparencies, and we generalize it for differing barriers. Our analytical formulae provide for convenient fitting of experimental data, also in the less studied, but practically relevant case of barrier asymmetry.

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