Dresden 2017 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 63: Poster: Quantum Dots and Optics

HL 63.27: Poster

Mittwoch, 22. März 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 Bayer^1,2 — 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.