GaAs quantum dots under quasiuniaxial stress: Experiment and theory

• Autoři: YUAN Xueyong; SILVA Saimon F. Covre da; CSONTOSOVÁ Diana; HUANG Huiying; SCHIMPF Christian; REINDL Marcus; LU Junpeng; NI Zhenhua; RASTELLI Armando; KLENOVSKÝ Petr
• Rok publikování: 2023
• Druh: Článek v odborném periodiku
• Časopis / Zdroj: Physical Review B
• Fakulta / Pracoviště MU: Přírodovědecká fakulta
• www: https://doi.org/10.1103/PhysRevB.107.235412
• Doi: http://dx.doi.org/10.1103/PhysRevB.107.235412
• Klíčová slova: Elasticity; Electronic structure; Excitons; Fermions; Lifetimes and widths; Luminescence; Nonlocality; Quantum cryptography; Stress
• Popis: The optical properties of excitons confined in initially unstrained GaAs/AlGaAs quantum dots are studied as a function of a variable quasiuniaxial stress. To allow the validation of state-of-the-art computational tools for describing the optical properties of nanostructures, we determine the quantum dot morphology and the in-plane components of externally induced strain tensor at the quantum dot positions. Based on these experimental parameters, we calculate the strain-dependent excitonic emission energy, degree of linear polarization, and fine-structure splitting using a combination of eight-band k·p formalism with multiparticle corrections using the configuration interaction method. The experimental observations are quantitatively well reproduced by our calculations and deviations are discussed.

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