Ghost Branch Photoluminescence From a Polariton Fluid Under Nonresonant Excitation
Maciej Pieczarka, Marcin Syperek, {\L}ukasz Dusanowski, Jan Misiewicz,, Fabian Langer, Alfred Forchel, Martin Kamp, Christian Schneider, Sven, H\"ofling, Alexey Kavokin, Grzegorz S\k{e}k
TL;DR
This paper investigates the photoluminescence of a polariton condensate under pulsed nonresonant excitation, revealing ghost branch emission and spectrum linearization, highlighting dissipative effects in nonequilibrium polariton systems.
Contribution
It reports the first observation of ghost branch photoluminescence in a polariton fluid under nonresonant excitation, with detailed spectral and temporal analysis.
Findings
Observation of ghost branch emission orthogonal to condensate polarization
Spectrum linearization at high excitation densities
Confirmation of ghost branch via time-resolved measurements
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.
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