Intershell Exchange Interaction in Charged GaAlAs Quantum Dots
M.R. Molasa,b, A.A.L. Nicolet b, M. Potemski b and A. Babiński a
aInstitute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warszawa, Poland
bLaboratoire National des Champs Magnétiques Intenses, CNRS-UJF-UPS-INSA, 25, av. des Martyrs, 38042 Grenoble, France
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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.

DOI: 10.12693/APhysPolA.124.785
PACS numbers: 78.67.Hc, 71.35.-y, 78.55.Cr, 71.70.Gm