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Analytical calculation of the excess current in the Octavio-Tinkham-Blonder-Klapwijk theory



G. Niebler, G. Cuniberti, and T. Novotny

Superconductor Science and Technology 22, 085016 (2009)

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 (1988 Phys. Rev. B 38 8707), 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 the barrier asymmetry.



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