Ghost branch photoluminescence from a polariton fluid under nonresonant excitation
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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. 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.
Pieczarka , M , Syperek , M , Dusanowski , Ł , Misiewicz , J , Langer , F , Forchel , A , Kamp , M , Schneider , C , Höfling , S , Kavokin , A & Sęk , G 2015 , ' Ghost branch photoluminescence from a polariton fluid under nonresonant excitation ' Physical Review Letters , vol 115 , no. 18 , 186401 , pp. 1-5 . DOI: 10.1103/PhysRevLett.115.186401
Physical Review Letters
© 2015 American Physical Society. This work is made available online in accordance with the publisher’s policies. This is the final published version of the work, which was originally published at http://dx.doi.org/10.1103/PhysRevLett.115.186401.
The authors acknowledge financial support from the bilateral project of Deutsche Forschungsgemeinschaft (Project LIEPOLATE) and the Polish Ministry of Science and Higher Education (Project No. DPN/N99/DFG/2010). The experiment was partially performed within the NLTK infrastructure, Project No. POIG.02.02.00-003/08-00. A. K. acknowledges financial support from the Russian Ministry of Education and Science (Contract No. 11.G34.31.0067).