Anisotropic Exchange Interaction between p-Shell Electron and s-Shell Hole in CdTe/ZnTe Quantum Dots

T. Kazimierczuka, A. Golnik a, M. Goryca a, P. Wojnar b, J.A. Gaj a and P. Kossackia,c a Institute of Experimental Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland b Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland c Grenoble High Magnetic Field Laboratory, CNRS, BP 166 38042 Grenoble Cedex 9, France

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We study electron-hole exchange interaction in a single CdTe/ZnTe quantum dot by polarization resolved photoluminescence measurements. We focus on recombination of excitonic states involving p-shell electrons: X2- and XX-. Recombination lines of X2- and XX- states exhibit fine structure, which can be consistently explained within a model with four parameters δiαβ representing strength of iso- and anisotropic parts of interaction between s-hole and s- or p-electron.

DOI: 10.12693/APhysPolA.116.882 PACS numbers: 78.67.Hc, 78.55.Et