Dissipative preparation of the exciton and biexciton in self-assembled quantum dots on picosecond time scales

Per Lennart Ardelt, Lukas Hanschke, Kevin A. Fischer, Kai Müller, Alexander Kleinkauf, Manuel Koller, Alexander Bechtold, Tobias Simmet, Jakob Wierzbowski, Hubert Riedl, Gerhard Abstreiter, Jonathan J. Finley

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73 Scopus citations

Abstract

Pulsed resonant fluorescence is used to probe ultrafast phonon-assisted exciton and biexciton preparation in individual self-assembled InGaAs quantum dots. By driving the system using large area (≥10π) near resonant optical pulses, we experimentally demonstrate how phonon-mediated dissipation within the manifold of dressed excitonic states can be used to prepare the neutral exciton with a fidelity ≥70%. By comparing the phonon-assisted preparation with resonant Rabi oscillations we show that the phonon-mediated process provides the higher-fidelity preparation for large pulse areas and is less sensitive to pulse area variations. Moreover, by detuning the laser with respect to the exciton transition, we map out the spectral density for exciton coupling to the bulk LA-phonon continuum. Similar phonon-mediated processes are shown to facilitate direct biexciton preparation via two-photon biexciton absorption, with fidelities >80%. Our results are found to be in very good quantitative agreement with simulations that model the quantum dot-phonon bath interactions with Bloch-Redfield theory.

Original languageEnglish
Article number241404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number24
DOIs
StatePublished - 2 Dec 2014

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