Regensburg 2013 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 71: Exciton polaritons and their condensates (HL, jointly with TT)
HL 71.9: Talk
Thursday, March 14, 2013, 11:45–12:00, H2
Electroluminescence from spatially confined exciton polaritons in a textured microcavity — •Karol Winkler1, Christian Schneider1, Julian Fischer1, Arash Rahimi-Iman1, Matthias Amthor1, Alfred Forchel1, Stephan Reitzenstein1,2, Sven Höfling1, and Martin Kamp1 — 1Wilhelm Conrad Röntgen Center for Complex Material Systems, Technische Physik, Universität Würzburg — 2Institut für Festkörperphysik, Technische Universität Berlin
Strong coupling between microcavity photons and quantum well excitons results in the formation of exciton polaritons. Spatial trapping of these quasi-particles in three dimensions allows for the observation of long-range coherence phenomena and could be exploited for new kind of coherent or non-classical light sources.
While electrical injection of quasi-2D-polaritons has been already archived, we report on electrically pumped formation of spatially confined polaritons. The trapping scheme is based on an elongated textured cavity which results in a three-dimensional confinement potential for the photonic part of the polaritons. An external bias can be used for fast manipulation of the exciton energy through the quantum confined stark effect with a simultaneous read out via resonant photocurrent measurements.