Acoustic phonon sideband dynamics during polaron formation in a single quantum dot
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When an electron–hole pair is optically excited in a semiconductor quantum dot, the host crystal lattice adapts to the presence of the generated charge distribution. Therefore, the coupled exciton–phonon system has to establish a new equilibrium, which is reached in the form of a quasiparticle called a polaron. Especially, when the exciton is abruptly generated on a timescale faster than the typical lattice dynamics, the lattice cannot follow adiabatically. Consequently, rich dynamics on the picosecond timescale of the coupled system is expected. In this study, we combine simulations and measurements of the ultrafast, coherent, nonlinear optical response, obtained by four-wave mixing (FWM) spectroscopy, to resolve the formation of this polaron. By detecting and investigating the phonon sidebands in the FWM spectra for varying pulse delays and different temperatures, we have access to the influence of phonon emission and absorption processes, which finally result in the emission of an acoustic wave packet.
Wigger , D , Karakhanyan , V , Schneider , C , Kamp , M , Höfling , S , Machnikowski , P , Kuhn , T & Kasprzak , J 2020 , ' Acoustic phonon sideband dynamics during polaron formation in a single quantum dot ' , Optics Letters , vol. 45 , no. 4 , pp. 919-922 . https://doi.org/10.1364/OL.385602
Copyright © 2020 Optical Society of America. This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://doi.org/10.1364/OL.385602