Regensburg 2013 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 50: Exciton Polaritons and their Condensates (jointly with HL)
TT 50.10: Talk
Thursday, March 14, 2013, 12:00–12:15, H2
Zeeman split nonlinear emission from electrically injected exciton-polaritons — •Matthias Amthor1, Christian Schneider1, Arash Rahimi-Iman1, Na Young Kim2,3, Julian Fischer1, Matthias Lermer1, Martin Kamp1, Stephan Reitzenstein1,4, Alfred Forchel1, Yoshihisa Yamamoto2,5, and Sven Höfling1 — 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. — 4Institut für Festkörperphysik, Technische Universität Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany. — 5National Institute of Informatics, Hitotsubashi, Chiyoda-ku, Tokyo 101-8430, Japan.
We report on magneto-optical measurements of an electrically driven GaAs based exciton-polariton light-emitting diode. The system under investigation is a p-i-n GaAs microcavity with a stack of four InGaAs quantum wells in the center of a one-lambda cavity, etched into circular pillars with diameters of 20 µm. 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. Additionally, we prove the conservation of the strong coupling regime above the first threshold by investigating the Zeeman splitting of the cavity resonance in the non-linear regime.