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Title: Collective state transitions of exciton-polaritons loaded into a periodic potential
Authors: Winkler, K.
Egorov, O. A.
Savenko, I. G.
Ma, X.
Estrecho, E.
Gao, T.
Müller, S.
Kamp, M.
Liew, Timothy Chi Hin
Ostrovskaya, E. A.
Höfling, S.
Schneider, C.
Keywords: Bose gases
Issue Date: 2016
Source: Winkler, K., Egorov, O. A., Savenko, I. G., Ma, X., Estrecho, E., Gao, T., et al. (2016). Collective state transitions of exciton-polaritons loaded into a periodic potential. Physical Review B, 93(12), 121303-.
Series/Report no.: Physical Review B
Abstract: We study the loading of a nonequilibrium, dissipative system of composite bosons—exciton polaritons—into a one-dimensional periodic lattice potential. Utilizing momentum resolved photoluminescence spectroscopy, we observe a transition between an incoherent Bose gas and a polariton condensate, which undergoes further transitions between different energy states in the band-gap spectrum of the periodic potential with increasing pumping power. We demonstrate controlled loading into distinct energy bands by modifying the size and shape of the excitation beam. The observed effects are comprehensively described in the framework of a nonequilibrium model of polariton condensation. In particular, we implement a stochastic treatment of quantum and thermal fluctuations in the system and conclude that polariton-phonon scattering is a plausible energy relaxation mechanism enabling transitions from the highly nonequilibrium polariton condensate in the gap to the ground band condensation for large pump powers.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.93.121303
Schools: School of Physical and Mathematical Sciences 
Rights: © 2016 American Physical Society. This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society. The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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