Regensburg 2010 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

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

HL 60.23: Poster

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

Electrostatic Traps for Indirect Excitons in Coupled Quantum Wells — •Georg Schinner1, Enrico Schubert1, Markus Stallhofer1, Dieter Schuh2, Andreas Wieck3, and Jörg Kotthaus11Fakultät für Physik and CeNS, Ludwig-Maximilians-Universität München, Germany — 2Institut für Angewandte und Experimentelle Physik, Universität Regensburg, Germany — 3Angewandte Festkörperphysik, Ruhr-Universität Bochum, Germany

In coupled double quantum wells (DQW) photo-generated and spatially indirect excitons can be widely manipulated via an externally applied voltage. Photoluminescence (PL) experiments employing gated devices reveal a strong quantum confined Stark effect (QCSE) with varying gate voltage and resulting in both a larger red shift of excitonic energy and a lifetime prolonged up to microseconds.

Here we report on PL experiments on indirect excitons in an InGaAs DQW device in which semitransparent gates are employed to tune the in-plane potential landscape. Using a confocal microscope at liquid Helium temperatures we map the in-plane excitons distribution.

Thus in transmission we are able to quantify the potential landscape for indirect excitons with high spatial and spectral resolution. We create via the QCSE efficient trapping potentials with electric fields and demonstrate control of the in-plane dynamics of an excitonic ensemble.

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