Fine structure of electron-hole complexes in single semimagnetic quantum dots

Photoluminescence spectra of CdSe/ZnSe/ZnMnSe semimagnetic quantum dots were studies in Faraday and Voigt geometries in the magnetic field up to 11 T at T=1.6 K. Incorporation of the nonmagnetic ZnSe layer between CdSe quantum dot layer and semimagnetic barriers reduced the strength of sp‐d exchange interaction and hence broadening of emission lines that obscures an observation of the fine structure of electron‐hole complexes. This allows one to identify exciton, biexciton and trion lines in the spectra of quantum dots and study their fine structure. An account of both sp‐d and electron‐hole exchange interactions are required in order to describe the Zeeman splitting and polarization behavior of the spectra.