Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 4: Spintronics: Nanostructures and Optics

HL 4.10: Vortrag

Montag, 7. März 2016, 12:15–12:30, H13

Novel properties of the Mn²⁺ spin-flip Raman scattering in ZnMnSe quantum wells — •Henning Moldenhauer¹, Carolin Lüders¹, Philipp Waldkirch¹, Dennis Kudlacik¹, Victor Sapega², Jörg Debus¹, Andreas Waag³, and Manfred Bayer^1,2 — ¹Experimentelle Physik 2, Technische Universität Dortmund, 44227 Dortmund, Germany — ²Ioffe Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — ³Institut für Halbleitertechnik, Technische Universität Braunschweig, 38106 Braunschweig, Germany

Diluted magnetic semiconductors (DMS) are promising materials for novel types of devices based on the tailoring of their spin properties leading to the field of semiconductor spintronics. Even though there has been a continuous study on Mn-based DMS during the last decades, several questions on the carrier-Mn ion interactions are still unanswered. We extend considerably the picture of the spin-flip Raman scattering (SFRS) of the Mn²⁺ ions by studying it in Faraday and tilted geometries in ZnMnSe quantum wells with Mn concentrations below 4%. We demonstrate that the paramagnetic Mn²⁺ resonances are caused by exchange interactions with conduction band electrons as well as hyperfine interactions with the Mn²⁺ nuclear spins. To verify this mechanism we apply radio-frequency (RF) fields, combined with resonant SFRS, to observe an impact of the nuclear spin depolarization on the Mn²⁺ SFRS signals. Surprisingly, the anti-Stokes Mn²⁺ scattering process is observed and also affected by the RF-fields.