Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 60: Poster II: Optical Properties, incl. Photonic Crystals and Ultrafast Phenomena

HL 60.22: Poster

Donnerstag, 25. März 2010, 18:00–20:00, Poster D1

Observation of Landau Levels in the Photoluminescence-Spectra of Direct and Indirect Magnetoexcitons — •Xaver Vögele1, Katarzyna Kowalik1, Florian Seilmeier1, Dieter Schuh2, Jörg Kotthaus1, and Alexander Holleitner31Center for NanoScience, Ludwig-Maximilians-Universität, D-80539 München — 2Institut für Angewandte und Experimentelle Physik, Universität Regensburg, D-93040 Regensburg — 3Technische Universität München, Walter Schottky Institut, D-85748 Garching

By means of photoluminescence (PL) spectra we have investigate the Landau level structure of direct and indirect excitons in AlGaAs/GaAs coupled-quantum-wells (CQW). The electric and magnetic fields were applied perpendicular to the CQW. For magnetic fields B > 2T higher Landau levels (LL) can be observed. The non-equilibrium carrier density was estimated from the intensity evolution of the different LLs for the indirect excitons: i) the second LL disappears for the fields corresponding to filling factor ν < 2 and ii) the intensity of the first LL decreases at ν = 1. We have noted that the effective density increases with increasing electric field. The observed phenomena will be discussed. We acknowledge financial support by the Center for NanoScience (CeNS), the Nanosystems Initiative Munich (NIM), the DFG Project KO 416/17 and A. v. Humboldt Stiftung.

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