Published in
American Physical Society, Physical Review Letters, 18(115), 2015
DOI: 10.1103/physrevlett.115.186401
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Ghost Branch Photoluminescence From a Polariton Fluid Under Nonresonant Excitation
,
Marcin Syperek,
Łukasz Dusanowski,
Jan Misiewicz,
Fabian Langer,
Alfred Forchel,
Martin Kamp,
Christian Schneider,
Sven Höfling,
Alexey Kavokin,
Grzegorz Sęk
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Abstract
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. ; Comment: 13 pages, 4 figures