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Magnetospectroscopy of excited states in charge-tunable GaAs/AlGaAs [111] quantum dots

Abstract : We present a combined experimental and theoretical study of highly charged and excited electron-hole complexes in strain-free (111) GaAs/AlGaAs quantum dots grown by droplet epitaxy. We address the complexes with one of the charge carriers residing in the excited state, namely, the “hot” trions X−* and X+*, and the doubly negatively charged exciton X2−. Our magnetophotoluminescence experiments performed on single quantum dots in the Faraday geometry uncover characteristic emission patterns for each excited electron-hole complex, which are very different from the photoluminescence spectra observed in (001)-grown quantum dots. We present a detailed theory of the fine structure and magnetophotoluminescence spectra of X−*,X+*, and X2− complexes, governed by the interplay between the electron-hole Coulomb exchange interaction and the heavy-hole mixing, characteristic for these quantum dots with a trigonal symmetry. Comparison between experiment and theory allows for precise charge state identification, as well as extraction of electron-hole exchange interaction constants and g factors for the charge carriers occupying excited states.
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https://hal.insa-toulouse.fr/hal-02053554
Contributor : Insa Toulouse Scd <>
Submitted on : Friday, March 1, 2019 - 2:07:44 PM
Last modification on : Friday, April 24, 2020 - 10:28:08 AM

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  • HAL Id : hal-02053554, version 1

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M. Durnev, M. Vidal, L. Bouet, Thierry Amand, M. Glazov, et al.. Magnetospectroscopy of excited states in charge-tunable GaAs/AlGaAs [111] quantum dots. Physical Review B: Condensed Matter and Materials Physics, American Physical Society, 2016, 93 (24). ⟨hal-02053554⟩

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