Dresden 2011 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 33: Spin-dependent Transport I
HL 33.10: Talk
Tuesday, March 15, 2011, 12:45–13:00, POT 251
Perpendicular Spin Injection and Polarization Features in InAs Quantum Dots — •Arne Ludwig1, Henning Soldat2, Frank Stromberg3, Astrid Ebbing1,4, Anne Warland3, Mingyuan Li2, Nils C. Gerhardt2, Dirk Reuter1, Oleg Petracic4, Martin Hofmann2, Heiko Wende3, Werner Keune3, and Andreas D. Wieck1 — 1Lehrstuhl für Angewandte Festkörperphysik, Ruhr-Universität Bochum — 2Lehrstuhl für Photonik und Terahertztechnologie, Ruhr-Universität Bochum — 3Fachbereich Physik and Center for Nanointegration Duisburg-Essen, Universität Duisburg-Essen — 4Experimentalphysik IV - Festkörperphysik, Ruhr-Universität Bochum
Self assembled InAs quantum dots (QDs) are zero dimensional multilevel systems with long spin relaxation times and thus offer great potential for spin optoelectronic research and applications.
Electrically injected spin polarization is efficiently transferred into circularly polarized photons if the injected spin is oriented perpendicularly to the growth plane. The optical polarization from an ensemble of QDs in a spin-LED is strongly magnetic field dependent due to the orbital character of the transitions of excited carriers. An unambiguous separation of spin injection and Zeeman shift is obtained by investigating the magnetic field dependence of the circular polarisation of the spin-LED emission.
Here we present and analyze perpendicular spin injection from Fe/Tb magnetic injectors at room temperature and in remanence. Polarization features of excited transitions are discussed.