Ultrafast magnetic polaron dynamics in Cd1-xMnxTe/ZnTe multiple quantum wells

R. Pittini, J. X. Shen, M. Takahashi, Y. Oka

    Research output: Contribution to journalArticlepeer-review

    1 Citation (Scopus)

    Abstract

    Optical pump-probe experiments were carried out in Cd1-xMnxTe/ZnTe multiple quantum wells to study the dynamics of the excitons and the exciton magnetic polarons in these materials. In the pump-probe spectra, three signals were detected. The main signal is negative and monitors the energy relaxation of the excitons created by the pump pulse. The two other pump-probe signals are positive and their intensity grows during the time when the excitons created by the pump pulse recombine. The low-energy positive pump-probe signal is found to track the average Mn spin polarization in the sample. Experiments performed with circular polarization show that long-range order is induced by a sufficiently intense pump beam. But in our samples, the spins of the excitons are found to be oriented mainly antiparallel to the long-range magnetization generated after the pump excitation. Furthermore, we found that, at high excitation densities, the excitons couple antiferromagnetically to the long-range 'background' magnetization of the Mn spins.

    Original languageEnglish
    Pages (from-to)326-330
    Number of pages5
    JournalPhysica E: Low-Dimensional Systems and Nanostructures
    Volume10
    Issue number1-3
    DOIs
    Publication statusPublished - 2001 May 1

    Keywords

    • CdMnTe
    • Exciton magnetic polaron
    • Pump probe
    • Quantum wells

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Atomic and Molecular Physics, and Optics
    • Condensed Matter Physics

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