Dephasing of InAs quantum dot p-shell excitons using two-dimensional coherent spectroscopy
Mesoscale and Nanoscale Physics
2019-08-16 v1
Abstract
The dephasing mechanisms of p-shell and s-shell excitons in an InAs self-assembled quantum dot ensemble are examined using two-dimensional coherent spectroscopy (2DCS). 2DCS provides a comprehensive picture of how the energy level structure of dots affects the exciton dephasing rates and recombination lifetimes. We find that at low temperatures, dephasing of s-shell excitons is lifetime limited, whereas p-shell excitons exhibit significant pure dephasing due to scattering between degenerate spin states. At elevated temperatures, quadratic exciton-phonon coupling plays an important role in both s-shell and p-shell exciton dephasing. We show that multiple p-shell states are also responsible for stronger phonon dephasing for these transitions
Cite
@article{arxiv.1808.07527,
title = {Dephasing of InAs quantum dot p-shell excitons using two-dimensional coherent spectroscopy},
author = {Takeshi Suzuki and Rohan Singh and Galan Moody and Marc Aßmann and Manfred Bayer and Arne Ludwig and Andreas D. Wieck and and Steven T. Cundiff},
journal= {arXiv preprint arXiv:1808.07527},
year = {2019}
}