Moody, G.
, Suzuki, T.
, Singh, R.
, Assman, M.
, Bayer, M.
, Ludwig, A.
, Wieck, A.
and Cundiff, S.
(2018),
Dephasing of InAs quantum dot p-shell excitons using two-dimensional coherent spectroscopy, Physical Review B, [online], https://doi.org/10.1103/PhysRevB.98.195304
(Accessed March 13, 2025)
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Dephasing of InAs quantum dot p-shell excitons using two-dimensional coherent spectroscopy
Published
Author(s)
, Takeshi Suzuki, Rohan Singh, Marc Assman, Manfred Bayer, Arne Ludwig, Andreas Wieck, Steven T. Cundiff
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.Citation
Physical Review B
Volume
98
Pub Type
Journals
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Created November 12, 2018, Updated July 9, 2019