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Dephasing of InAs quantum dot p-shell excitons using two-dimensional coherent spectroscopy



Galan Moody, Takeshi Suzuki, Rohan Singh, Marc Assman, Manfred Bayer, Arne Ludwig, Andreas Wieck, Steven T. Cundiff


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.
Physical Review B


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], (Accessed April 21, 2024)
Created November 12, 2018, Updated July 9, 2019