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Experimental realization of a polariton beam amplifier

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arxiv 1601.07332 v1 pith:MSA3DSC6 submitted 2016-01-27 cond-mat.mes-hall cond-mat.quant-gas

Dominik Niemietz , Johannes Schmutzler , Przemyslaw Lewandowski , Karol Winkler , Marc A{ss}mann , Stefan Schumacher , Sebastian Brodbeck , Martin Kamp
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Christian Schneider Sven Höfling Manfred Bayer
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classification cond-mat.mes-hallcond-mat.quant-gas
keywords polaritonbeampotentialamplifierbackgroundcarrierscavityexcitation
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In this report we demonstrate a novel concept for a planar cavity polariton beam amplifier using non-resonant excitation. In contrast to resonant excitation schemes, background carriers are injected which form excitons, providing both gain and a repulsive potential for a polariton condensate. Using an attractive potential environment induced by a locally elongated cavity layer, the repulsive potential of the injected background carriers is compensated and a significant amplification of polariton beams is achieved without beam distortion.

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