Regensburg 2019 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 55: Superconductivity: Tunneling and Josephson Junctions
TT 55.8: Vortrag
Donnerstag, 4. April 2019, 11:30–11:45, H23
Particle-conserving theory for transport through interacting Josephson junctions — •Jordi Picó-Cortés1, 2, Andrea Donarini1, and Milena Grifoni1 — 1Institute for Theoretical Physics, University of Regensburg, 93040 Regensburg, Germany — 2Instituto de Ciencia de Materiales de Madrid (CSIC), E-28049, Madrid, Spain
When two superconductors are coupled together through a weak link, tunneling of Cooper pairs gives rise to a supercurrent through the junction, as predicted by Josephson [1]. Usually, transport through mesoscopic Josephson junctions (JJ) is described using the mean field theory of superconductivity. This approach has the obvious limitation of treating an inherently many-body effect through an effective single-particle theory which violates particle’s conservation. We investigate charge transport and the Josephson effect through an interacting quantum dot coupled to two superconductors within a particle-conserving theory of superconductivity. Within a reduced density matrix approach to transport [2], we can account for the many-body aspects of superconductivity and interactions in the dot on the same footing.
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