We calculate the optical properties of nitride-based quantum dots by taking into account quantum confinement as well as electron–hole interaction. We analyze model structures simulating In_xGa_{1−x}N dots in In_yGa_{1−y}N layers with different alloy compositions. We discuss the trends with the dot size and show that quantum confined excitations exist for a broad range of sizes down to the smallest observed dots. Our results allow us to identify the strong role of Coulomb correlations in the optical spectra and to predict a strong influence of photoexcitation power on selection rules in polarized samples. The signature of quantum confinement can be utilized for a critical interpretation of measured optical spectra.
Optical spectra of nitride quantum dots: Quantum confinement and electron-hole coupling / Hohenester, U.; DI FELICE, R.; Molinari, E.; Rossi, Fausto. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 75:22(1999), pp. 3449-3451. [10.1063/1.125292]
Optical spectra of nitride quantum dots: Quantum confinement and electron-hole coupling
ROSSI, FAUSTO
1999
Abstract
We calculate the optical properties of nitride-based quantum dots by taking into account quantum confinement as well as electron–hole interaction. We analyze model structures simulating In_xGa_{1−x}N dots in In_yGa_{1−y}N layers with different alloy compositions. We discuss the trends with the dot size and show that quantum confined excitations exist for a broad range of sizes down to the smallest observed dots. Our results allow us to identify the strong role of Coulomb correlations in the optical spectra and to predict a strong influence of photoexcitation power on selection rules in polarized samples. The signature of quantum confinement can be utilized for a critical interpretation of measured optical spectra.File | Dimensione | Formato | |
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https://hdl.handle.net/11583/1405215
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