Volume 41, Number 2, January II 1998
|Page(s)||195 - 200|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Ballistic transport in superconducting weak links in a microwave field
Institut für Theoretische Physik, Eberhardt-Karls
Universität Tübingen, 72076 Tübingen, Germany
2 Institut für Theoretische Festkörperphysik, Universität Karlsruhe, 76131 Karlsruhe, Germany
3 P. N. Lebedev Physics Institute, Leninsky Prospect 53, Moscow 117924, Russia
Accepted: 1 December 1997
Nonequilibrium effects and their impact on charge transport in superconducting ballistic weak links biased by an ac voltage are investigated microscopically. The microwave field destroys the phase coherence during the multiple Andreev reflection cycle and leads to effective cooling of subgap quasiparticles accelerated due to multiple Andreev reflection. For small bias voltages this effect results in a strong supression of both the excess current and the conductance of the weak link. At higher voltages (of the order of the gap) sideband subharmonic gap structures of the I-V curve are found.
PACS: 74.40.+k – Fluctuations (noise, chaos, nonequilibrium superconductivity, localization, etc.) / 74.50.+r – Proximity effects, weak links, tunneling phenomena, and Josephson effects / 74.80.Fp – Point contacts; SN and SNS junctions
© EDP Sciences, 1998
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