Regensburg 2002 – scientific programme
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TT: Tiefe Temperaturen
TT 11: Supraleitung: Elektronenstruktur, Phononen, Tunneln, Ordnungsparameter II
TT 11.1: Talk
Tuesday, March 12, 2002, 15:00–15:15, H19
Quasiclassical theory of ac Josephson effect in unconventional superconductors — •Andreas Poenicke1, Juan Carlos Cuevas1, and Mikael Fogelström2 — 1Institut für Theoretische Festkörkperphysik, Universität Karlsruhe, 76128 Karlsruhe, Germany — 2Institute of Theoretical Physics, Chalmers University of Technology and Göteborgs University, S-41296 Göteborg, Sweden
We present a theoretical description of the ac Josephson effect in unconventional superconducting junctions. Our approach is valid for arbitrary transparency of the junction and allows us to take into account the contribution of multiple Andreev reflections. In addition to the self-consistent determination of the order parameter, this formalism incorporates other crucial ingredients like bulk impurities, surface roughness and other pair-breaking mechanisms. We apply this theory to the case of the superconducting cuprates, in which it is believed that the order parameter has a dominant d-wave component. Our study throws light on three subjects presently under debate: (i) the possibility of observing the so-called subharmonic gap structure in d-wave junctions, (ii) the splitting of the zero energy bound states with magnetic field, and (iii) the possible existence of a subdominant order parameter.