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HL: Fachverband Halbleiterphysik
HL 63: Poster: Quantum Dots and Optics
HL 63.27: Poster
Wednesday, March 22, 2017, 15:00–19:00, P1A
Dependences of the spin-flip Raman scattering efficiency of Mn2+ ions in (Zn,Mn)Se/(Zn,Be)Se quantum wells — •Katja Barthelmi1, Henning Moldenhauer1, Carolin Lüders1, Dennis Kudlacik1, Victor Sapega2, Jörg Debus1, and Manfred Bayer1,2 — 1Experimentelle Physik 2, Technische Universität Dortmund, Dortmund, Germany — 2Ioffe Institute, Russian Academy of Sciences, St. Petersburg, Russia
Due to the possibility of controlled manipulation of the spin properties of carriers, diluted magnetic semiconductors (DMS) are promising materials for spintronic applications. Extensive studies on DMS containing Mn2+ ions have investigated the carrier-Mn interactions, but still many questions remain unanswered.
In that context, we have studied the dependences of the spin-flip Raman scattering (SFRS) efficiency of Mn2+ ions in (Zn,Mn)Se/(Zn,Be)Se quantum wells with Mn concentrations of about 1.5%. We have shown that the Mn spin-flip scattering efficiency is strongly amplified by resonant excitation of the exciton in close-to-Faraday geometries and at certain magnetic field strengths. We could attribute this amplification to an interaction of single Mn2+ spins with clusters of several Mn2+ spins. Furthermore, we have observed that the Mn2+ SFRS exhibits a strong dependence on temperature and excitation density. In addition to that, we have detected a significant difference between the Mn2+ SFRS shift on the Stokes and anti-Stokes side, which may result from the nonlinear dispersion of the exciton magnetic polaron involved in the SFRS process.