Regensburg 2013 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 71: Exciton polaritons and their condensates (HL, jointly with TT)
HL 71.8: Vortrag
Donnerstag, 14. März 2013, 11:30–11:45, H2
Magnetic field interaction of exciton-polariton-condensates in a GaAs-quantum-well microcavity — •Julian Fischer1, Ingo Lederer1, Alexander Chernenko2, Sebastian Brodbeck1, Arash Rahimi-Iman1, Matthias Amthor1, Alfred Forchel1, Christian Schneider1, Martin Kamp1, and Sven Höfling1 — 1Technische Physik, Physikalisches Institut, Universität Würzburg and Wilhelm Conrad Röntgen Research Center for Complex Material Systems, Universität Würzburg, Am Hubland, 97074 Würzburg, Germany — 2Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, 142432 Russia
In this work we investigate the interaction of exciton-polaritons with an external magnetic field in a GaAs-quantum-well-microcavity. The magnetic field up to B=5T is applied in Faraday configuration. We focus on measurements of the Zeeman-splitting for the three regimes of our quantum-well microcavity: uncondensed exciton-polariton at low excitation power, exciton-polariton-condensate and a photon dominated regime above the mott density of excitons. For the uncondensed polaritons we measure the expected linear dependence of the Zeeman-splitting on the magnetic field, while we observed a quenching of the Zeeman-splitting for the condensate case, referred to as No-dqSpin-Meissner-effectNo-dq. Above the mott-density the Zeeman-splitting is not measurable anymore due to the negligible excitonic content. Hence, the Zeeman-splitting is a reliable tool to distinguish a polaritonic system from a photonic one.