Regensburg 2022 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 26: Superconductivity: Tunnelling and Josephson Junctions

TT 26.12: Vortrag

Donnerstag, 8. September 2022, 12:30–12:45, H10

Interplay of Cooper pair and quasiparticle tunneling in the dynamics of an Anderson pseudospin — •Christoph Rohrmeier, Jordi Picó-Cortés, Andrea Donarini, and Milena Grifoni — Institute of Theoretical Physics, University of Regensburg, Germany

In an interacting quantum dot coupled to superconducting reservoirs, the state of the system can be described in terms of a pseudospin [1] where "up" represents a fully occupied and "down" means an empty dot [2]. We investigate the dynamics of this Anderson pseudospin with the help of a generalized master equation based on a particle-conserving approach to superconductivity [3]. Superconducting correlations involved in Cooper pair and quasiparticle tunneling manifest in the pseudospin dynamics. The pseudospin precession is governed by an effective magnetic field [4] of which we give an analytical expression including finite gap, bias as well as interaction.

[1] P. Anderson, Phys. Rev. 112, 1900 (1958)

[2] M. Governale, M. Pala, Jürgen König, Phys. Rev. B 77, 134513 (2008)

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

[4] C. Rohrmeier and A. Donarini, Phys. Rev. B 105, 205418 (2022)