Ghost branch photoluminescence from a polariton fluid under nonresonant excitation

Maciej Pieczarka, Marcin Syperek, Łukasz Dusanowski, Jan Misiewicz, Fabian Langer, Alfred Forchel, Martin Kamp, Christian Schneider, Sven Höfling, Alexey Kavokin, Grzegorz Sęk

Research output: Contribution to journalArticlepeer-review

21 Citations (Scopus)


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. Polarization of both branches is understood in terms of spin-dependent polariton-polariton scattering. The presence of the ghost branch has been confirmed in time-resolved measurements. The effects of disorder and dissipation in the photoluminescence of polariton condensates and their excitations are discussed.
Original languageEnglish
Article number186401
Pages (from-to)1-5
Number of pages5
JournalPhysical Review Letters
Issue number18
Publication statusPublished - 26 Oct 2015


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