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Dresden 2009 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 48: Poster 2

HL 48.16: Poster

Thursday, March 26, 2009, 15:00–17:30, P2

Characterization of Spatially Indirect Excitons in Coupled Quantum WellsGeorg Schinner1, •Markus Stallhofer1, Katarzyna Kowalik1, Dieter Schuh2, Werner Wegscheider2, Alexander Holleitner1,3, and Jörg Kotthaus11Fakultät für Physik and Center for NanoScience, LMU Munich, Geschwister-Scholl-Platz 1, D-80539 München, Germany — 2Institut für Angewandte und Experimentelle Physik, Universität Regensburg, Universitätsstraße 31, D-93040 Regensburg, Germany — 3TU Munich, Walter Schottky Institut, Am Coulombwall 3, 85748 Garching, Germany

In coupled quantum wells photo-generated and spatially indirect excitons can be widely manipulated via an externally applied voltage. The quantum-confined Stark effect (QCSE) results in a large enhancement of excitonic lifetime and a red shift in energy. A number of photoluminescence (PL) experiments have been performed on indirect excitons in GaAs double quantum wells (DQW) that were tuned via a metallic top gate. We characterize an especially designed InGaAs DQW-heterostructure with PL and transmission experiments at liquid Helium temperatures. The QCSE was measured with PL and determined to be around 150 meV/V, a very high value compared to literature. Therefore, it is possible to achieve a large energy shift by applying relatively low voltages in our sample. In a confocal microscope we perform transmission experiments on the indirect excitons in a field-effect structure with a semitransparent titanium top gate. They allow investigating electron-hole pairs under resonant excitation.

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