Regensburg 2016 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 96: Magnetic Semiconductors

HL 96.4: Vortrag

Freitag, 11. März 2016, 10:45–11:00, H13

Long-range p-d exchange interaction in a ferromagnet-semiconductor hybrid structure — •Matthias Salewski¹, Vladimir L. Korenev^1,2, Ilya A. Akimov^1,2, Victor V. Sapega^2,3, Lukas Langer¹, Ina V. Kalitukha², Jörg Debus¹, Roslan I. Dzhioev², Dmitri R. Yakovlev^1,2, David Müller¹, Chrstoph Schröder⁴, Heinz Hövel⁴, Grzegorz Karczewski⁵, Maciej Wiater⁵, Tomasz Wojtowicz⁵, Yuri G. Kusrayev², and Manfred Bayer^1,2 — ¹Experimentelle Physik 2, Technische Universität Dortmund, D-44221 Dortmund, Germany — ²Ioffe Physical-Technical Institute, Russian Academy of Sciences, 194021 St. Petersburg, Russia — ³Physical Faculty of St. Petersburg State University, 198504 St. Petersburg, Russia — ⁴Experimentelle Physik 1, Technische Universität Dortmund, D-44221 Dortmund, Germany — ⁵Institute of Physics, Polish Academy of Sciences, PL-02668 Warsaw, Poland

The magnetic coupling in hybrid structures composed of semiconductor (SC) nanostructures and ferromagnetic layers (FM) typically depends on the wave function overlap of SC charge carriers (p-system) and FM ions (d-system) and is therefore short-ranged. Here we report on a hybrid system with surprisingly long-ranged, robust coupling that does not vary with spacer width up to more than 30 nm. We suggest that the resulting spin polarization of acceptor-bound holes is induced by an effective p-d exchange that is mediated by elliptically polarized phonons.