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, and Grzegorz Sęk

Phys. Rev. Lett. 115, 186401 – Published 26 October 2015

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. 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.

Received 23 March 2015

DOI:https://doi.org/10.1103/PhysRevLett.115.186401

Authors & Affiliations

Maciej Pieczarka^1,*, Marcin Syperek¹, Łukasz Dusanowski¹, Jan Misiewicz¹, Fabian Langer², Alfred Forchel², Martin Kamp², Christian Schneider², Sven Höfling^2,3, Alexey Kavokin^4,5, and Grzegorz Sęk¹

¹Laboratory for Optical Spectroscopy of Nanostructures, Department of Experimental Physics, Wrocław University of Technology, Wybrzeże Wyspiańskiego 27, 50-370 Wrocław, Poland
²Technische Physik, University of Würzburg and Wilhelm-Conrad-Röntgen-Research Center for Complex Material Systems (RCCM), Am Hubland, D-97074 Würzburg, Germany
³SUPA, School of Physics and Astronomy, University of St. Andrews, St. Andrews KY16 9SS, United Kingdom
⁴Spin Optics Laboratory, Saint Petersburg State University, 1 Ulianovskaya, 198504 St. Petersburg, Russia
⁵Physics and Astronomy School, University of Southampton, Highfield, Southampton SO17 1BJ, United Kingdom

^*Corresponding author. maciej.pieczarka@pwr.edu.pl

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Issue

Vol. 115, Iss. 18 — 30 October 2015

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