Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: Poster I

HL 35.6: Poster

Dienstag, 8. März 2016, 15:00–19:00, Poster A

Spin-flip Raman scattering of the Mn²⁺ ions in (Zn,Mn)Se quantum wells — •Carolin Lüders¹, Henning Moldenhauer¹, Philipp Waldkirch¹, Dennis Kudlacik¹, Victor F. Sapega^1,2, Andreas Waag³, Jörg Debus¹, and Manfred Bayer^1,2 — ¹Experimentelle Physik 2, Technische Universität, 44227 Dortmund, Germany — ²Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — ³Institute of Semiconductor Technology, University of Braunschweig, 38106 Braunschweig, Germany

A comprehensive and unified picture of the Mn-ion interactions with carriers in diluted magnetic semiconductors is still missing up to now. Therefore, we have studied the resonant spin-flip Raman scattering (SFRS) of the Mn²⁺ ions in Zn_1−xMn_xSe/(Zn,Be)Se quantum-well structures with low Mn concentrations (x ≤ 0.04) and type-I band alignment. Previous studies focused on the multiple Mn²⁺ SFRS in tilted geometries, where the magnetic field direction embraced an angle with the quantum-well growth axis; while, for example, the explanation of the Faraday-geometry mechanism was not yet clarified. We propose a Mn²⁺ spin-flip mechanism for the Faraday geometry, and demonstrate the presence of anti-Stokes Mn²⁺ scattering signals, whose Raman shifts are moreover considerably different to that of the Stokes lines. Additionally, the resonance profile shows that the spin-flips occur preferably under resonant excitation of the heavy-hole exciton.