Dynamics of excitonic magnetic polarons in nanostructure diluted magnetic semiconductors

Exciton dynamics has been studied in quantum wells, quantum dots and quantu m wires of diluted magnetic semi conductors by time-resolved photoluminesce nce spectroscopy. The transient exciton photoluminescence with resonant exc itation in Cd1-xMnxTe/ZnTe (x = 0.1) multiple quantum wells shows the forma tion of magnetic polarons in the quantum well excitons. Free and localized states of the excitonic magnetic polarons are distinguished from the differ ence of the lifetimes and the binding energies, The magnetic polaron format ion accompanied with emission or absorption of LO phonons was also observed , Quantum dots of Cd1-xMnxSe grown by the self-organization mode showed the luminescence of confined excitons in the dots, The Mn ions in the quantum dots induce large Zeeman shifts and the excitonic magnetic polaron formatio n in the dots. Quantum wires of Cd1-xMnxSe showed polarized exciton emissio ns parallel to the wires. The polarization was decreased by the external ma gnetic field perpendicular to the wires. The excitonic magnetic polaron sta tes in the quantum wires are also discussed. (C) 1999 Elsevier Science B.V. All rights reserved.