Dresden 2014 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 95: Polaritons
HL 95.2: Vortrag
Donnerstag, 3. April 2014, 11:45–12:00, POT 051
An electrically driven polariton laser — •Matthias Amthor1, Arash Rahimi-Iman1, Na Young Kim2,3, Julian Fischer1, Lukas Worschech1, Martin Kamp1, Christian Schneider1, Alfred Forchel1, Yoshihisa Yamamoto2,4, and Sven Höfling1,5 — 1Technische Physik and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems, Universität Würzburg, D-97074 Würzburg, Am Hubland, Germany. — 2E.L. Ginzton Laboratory, Stanford University, Stanford CA, 94305, USA. — 3Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan. — 4National Institute of Informatics, Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan. — 5SUPA, School of Physics and Astronomy, University of St Andrews, St Andrews, KY16 9SS, United Kingdom
We report on magneto-optical measurements of an electrically driven GaAs based exciton-polariton light-emitting diode. While using direct current excitation at a temperature of 8K three different regimes occur in the energy-momentum dispersion characteristics. Subject to an applied magnetic field in Faraday configuration, we observe two distinct nonlinearities in the excitation power dependent output characteristics and a characteristic shift of the emission energy. Furthermore the linewidth shows a drop at the first threshold, which is a sign for the buildup of temporal coherence, and continously decreases to the resolution limit in the photonic regime. Additionally, we prove the conservation of the strong coupling regime above the first threshold and its loss above the second threshold by investigating the Zeeman splitting.