ACTA

Fine Structure of Neutral Excitons in Single GaAlAs Quantum Dots

M. Molas^{a, b}, K. Gołasa^a, B. Piętka^a, M. Potemski^b and A. Babiński^a
^aInstitute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, PL-00-681 Warsaw, 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 neutral excitons in GaAlAs/AlAs quantum dots is investigated. Low-temperature polarization-sensitive photoluminescence measurements of single quantum dots are performed. It is found that neutral excitons (X) in the quantum dots exhibit a fine structure splitting. The fine structure splitting ranges from 10 μeV to 100 μeV and correlates with the X energy. The polarization axis of the fine structure splitting is well oriented along [110] crystallographic direction of a substrate. The orientation is attributed to the elongation of GaAlAs/AlAs quantum dots in the [110] direction of the substrate.

DOI: 10.12693/APhysPolA.122.988
PACS numbers: 78.55.Cr, 78.67.Hc