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Ghost Branch Photoluminescence From a Polariton Fluid Under Nonresonant Excitation

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arxiv 1503.07402 v2 pith:A7N2PQUI submitted 2015-03-25 cond-mat.mes-hall

Maciej Pieczarka , Marcin Syperek , {L}ukasz Dusanowski , Jan Misiewicz , Fabian Langer , Alfred Forchel , Martin Kamp , Christian Schneider
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Sven Höfling Alexey Kavokin Grzegorz Sęk
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classification cond-mat.mes-hall
keywords branchghostpolaritoncondensateexcitationnonresonantphotoluminescencepolarized
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An expanding polariton condensate is investigated under pulsed nonresonant excitation with a small laser pump spot. Far above the condensation threshold we observe a pronounced increase in the dispersion curvature with a subsequent linearization of the spectrum and strong luminescence from a ghost branch orthogonally polarized with respect to the linearly polarized condensate emission. The presence of the ghost branch has been confirmed in time-resolved measurements. The dissipative and nonequilibrium effects in the photoluminescence of polariton condensates and their excitations are discussed.

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