Dynamics of excitonic magnetic polarons in nanostructure diluted magnetic semiconductors

Exciton dynamics has been studied in quantum wells, quantum dots and quantum wires of diluted magnetic semi conductors by time-resolved photoluminescence spectroscopy. The transient exciton photoluminescence with resonant excitation in Cd(1-x)Mn(x)Te/ZnTe (x = 0.1) multiple quantum wells shows the formation of magnetic polarons in the quantum well excitons. Free and localized states of the excitonic magnetic polarons are distinguished from the difference of the lifetimes and the binding energies, The magnetic polaron formation accompanied with emission or absorption of LO phonons was also observed, Quantum dots of Cd(1-x)Mn(x)Se 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 formation in the dots. Quantum wires of Cd(1-x)Mn(x)Se showed polarized exciton emissions parallel to the wires. The polarization was decreased by the external magnetic field perpendicular to the wires. The excitonic magnetic polaron states in the quantum wires are also discussed. (C) 1999 Elsevier Science B.V. All rights reserved.