Difference in charge and spin dynamics in a quantum dot-lead coupled system
Abstract
We analyze time evolution of charge and spin states in a quantum dot coupled to an electric reservoir. Utilizing high-speed single-electron detection, we focus on dynamics induced by the first-order tunneling. We find that there is a difference between the spin and the charge relaxation: the former appears slower than the latter. The difference depends on the Fermi occupation factor and the spin relaxation becomes slower when the energy level of the quantum dot is lowered. We explain this behavior by a theory which includes the first-order tunneling processes. We conduct detailed comparison of the experiment and the theory with changing the energy of the quantum dot levels, and the theory can reproduce the experimental results.
Cite
@article{arxiv.1808.05303,
title = {Difference in charge and spin dynamics in a quantum dot-lead coupled system},
author = {Tomohiro Otsuka and Takashi Nakajima and Matthieu R. Delbecq and Peter Stano and Shinichi Amaha and Jun Yoneda and Kenta Takeda and Giles Allison and Sen Li and Akito Noiri and Takumi Ito and Daniel Loss and Arne Ludwig and Andreas D. Wieck and Seigo Tarucha},
journal= {arXiv preprint arXiv:1808.05303},
year = {2019}
}
Comments
4 pages, 4 figures