SKM 2021 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 18: Quantum Dots and Wires (joint session HL/TT)
HL 18.2: Talk
Thursday, September 30, 2021, 14:00–14:15, H4
Electric-field induced tuning of electronic correlation in weakly confining quantum dots — Huiying Huang1, Diana Csontosová2,3, Santanu Manna1, Yongheng Huo4, Rinaldo Trotta5, Armando Rastelli1, and •Petr Klenovský2,3 — 1Johannes Kepler University Linz, Linz, Austria — 2Masaryk University, Brno, Czech Republic — 3Czech Metrology Institute, Brno, Czech Republic — 4University of Science and Technology of China, Hefei, Anhui, China — 5Sapienza University of Rome, Rome, Italy
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.