Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: Superconductivity: Tunnelling and Josephson Junctions

TT 26.11: Vortrag

Donnerstag, 8. September 2022, 12:15–12:30, H10

Non-equilibrium transport in Josephson junctions through interacting nanostructures — •Jordi Picó Cortés^1,2, Gloria Platero², and Milena Grifoni¹ — ¹Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany — ²Instituto de Ciencia de Materiales de Madrid (CSIC) E-28049, Spain

Studying transport through interacting nanostructures is challenging due to the interplay between strong interactions and the coupling to large thermalized leads. In the case of superconducting leads, this is further complicated by a number of features particular to Josephson junctions, chiefly the effect of Cooper pairs and the resulting anomalous transport. In this work, we develop a diagrammatic approach to transport through weakly coupled Josephson junctions [1,2,3] which treats the interaction inside the dot exactly and employ it to describe the conventional and Josephson currents. The dynamics of Cooper pairs out of equilibrium are described in a particle-conserving formalism, which avoids issues arising from the usual BCS treatment, allowing us to extend the description of electron pairing inside the dot and the 0 −π transition beyond the usual equilibrium treatment.

[1] M. Governale, M.G. Pala, J. König, Phys. Rev. B 77, 134513 (2008)

[2] B. Hiltscher, M. Governale, J. König, Physical Review B 86, 235427 (2012)

[3] J. Siegl, J. Picó-Cortés, M. Grifoni, arXiv:2205.13936 (2022)