SKM 2021 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 3: Poster Sesssion I: Quantum Chaos and Many-Body Quantum Dynamics
DY 3.11: Poster
Dienstag, 28. September 2021, 17:30–19:30, P
A particle conserving framework to transport in AC-driven quantum dots contacted to superconducting leads — •Julian Siegl1, Jordi Pico-Cortes1,2, and Milena Grifoni1 — 1Universität Regensburg — 2Universidad Autónoma de Madrid
Transport through an interacting quantum dot coupled to superconducting leads and subject to DC and AC-bias is studied within a particle conserving framework. In this formulation, charge conservation during tunneling of an electron out of the dot includes processes where a quasiparticle is destroyed in the superconductor and simultaneously a Cooper pair is created. This possibility gives rise to non vanishing coherences of the density matrix involving Cooper pairs and states with zero or double occupancy in the quantum dot. In the sequential tunneling regime (second order in the tunneling), the *anomalous* contribution to the current due to the coherences is negligible and quasiparticle transport dominates. Here, the combination of AC and DC bias gives rise to stability diagrams whose features cannot be explained within the simple Tien-Gordon theory. At higher orders the coherences are responsible for the supercurrent in the junction.