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Intershell Exchange Interaction in Charged GaAlAs Quantum Dots

100%
Molas M., Nicolet A., Potemski M., Babiński A.
Acta Physica Polonica A
|
2013
|
vol. 124
|
issue 5
785-787
EN
Optical anisotropy of charged excitons and biexcitons related to the single-particle s- and p-shell emission in GaAlAs/AlAs quantum dots is investigated. The polarization-dependence and time-resolved micro-photoluminescence measurements were performed. Cross-correlation measurements were used to identify the ladder of excitonic states and allowed us to show two cascade pathways, including the spin singlet and triplet states of charged excitons and biexcitons. The fine structure of the studied states is described and analysed in terms of electron-electron, hole-hole, and electron-hole exchange interactions.
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Magnetic Field Effect on the Excitation Spectrum of a Neutral Exciton in a Single Quantum Dot

88%
Molas M., Nicolet A., Piętka B., Babiński A., Potemski M.
Acta Physica Polonica A
|
2014
|
vol. 126
|
issue 5
1066-1068
EN
Excitation-energy-dependent magnetospectroscopic measurements of a single GaAlAs/AlAs quantum dot were performed. A significant effect of the excitation energy on the photoluminescence spectra is reported. The photoluminescence excitation spectroscopy has been used to investigate the excitation spectrum of a single electron-hole pair - a neutral exciton in magnetic field up to 14 T. The observed resonances exhibit diamagnetic shift characteristic of an s-shell related emission. In our opinion, the creation of excited complexes involving an excited hole and a ground electron is responsible for the process.
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