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Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 50: Exciton Polaritons and their Condensates (jointly with HL)

TT 50.8: 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 Höfling11Technische 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.

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