Electric field induced tuning of electronic correlation in weakly confining quantum dots

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Authors

HUANG Huiying CSONTOSOVÁ Diana MANNA Santanu HUO Yongheng TROTTA Rinaldo RASTELLI Armando KLENOVSKÝ Petr

Year of publication 2021
Type Article in Periodical
Magazine / Source Physical Review B
MU Faculty or unit

Faculty of Science

Citation
Web https://doi.org/10.1103/PhysRevB.104.165401
Doi http://dx.doi.org/10.1103/PhysRevB.104.165401
Keywords electric correlation; quatnum dots; weakly confined systems; electric field; Stark shift; valence band mixing
Description We conduct a combined experimental and theoretical study of the quantum confined Stark effect in GaAs/AlGaAs quantum dots obtained with the local droplet etching method. In the experiment, we probe the permanent electric dipole and polarizability of neutral and positively charged excitons weakly confined in GaAs quantum dots by measuring their light emission under the influence of a variable electric field applied along the growth direction. Calculations based on the configuration-interaction method show excellent quantitative agreement with the experiment and allow us to elucidate the role of Coulomb interactions among the confined particles and—even more importantly—of electronic correlation effects on the Stark shifts. Moreover, we show how the electric field alters properties such as built-in dipole, binding energy, and heavy-light hole mixing of multiparticle complexes in weakly confining systems, underlining the deficiencies of commonly used models for the quantum confined Stark effect.
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