Pair-amplitude dynamics in strongly-coupled superconductor-quantum dot hybrids
Abstract
We consider a three-terminal system consisting of a quantum dot strongly coupled to two superconducting reservoirs in the infinite gap limit and weakly coupled to a normal metal. Using a real-time diagrammatic approach, we calculate the dynamics of the proximity-induced pair amplitude on the quantum dot. We find that after a quench the pair amplitude shows pronounced oscillations with a frequency determined by the coupling to the superconductors. In addition, it decays exponentially on a time scale set by the coupling to the normal metal. Strong oscillations of the pair amplitude occur also when the system is periodically driven both in the adiabatic and fast-driving limit. We relate the dynamics of the pair amplitude to the Josephson and Andreev current through the dot to demonstrate that it is an experimentally accessible quantity.
Cite
@article{arxiv.2110.10100,
title = {Pair-amplitude dynamics in strongly-coupled superconductor-quantum dot hybrids},
author = {Markus Heckschen and Björn Sothmann},
journal= {arXiv preprint arXiv:2110.10100},
year = {2022}
}