Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 31: SC: Tunnelling, Josephson Junctions
TT 31.10: Vortrag
Donnerstag, 25. März 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 Novotný1 — 1Department 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.