Mr. Lijian Mai Profile

Lijian Mai

at IBM Research - Zurich

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Proceedings Article | 8 February 2015 Paper

Exciton-polariton Bose-Einstein condensation with a polymer at room temperature

Thilo Stöferle, Johannes Plumhof, Lijian Mai, Ullrich Scherf, Rainer Mahrt

Proceedings Volume 9370, 93702T (2015) https://doi.org/10.1117/12.2083831

KEYWORDS: Polaritons, Polymers, Photons, Excitons, Spectroscopy, Optical microcavities, Absorption, Laser damage threshold, Dispersion, Picosecond phenomena

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We create exciton-polariton quasi-particles by exciting optically a microcavity filled with a ladder-type conjugated polymer in the strong coupling regime. At room temperature thermalization of these quasi-particles occurs while it is suppressed at low temperature due to a relaxation bottleneck. Above a certain excitation threshold with incoherent offresonant picosecond laser pulses, we observe the emergence of non-equilibrium Bose-Einstein condensation in the lower polariton branch. This is evidenced by several distinct features such as a blue-shifted emission peak at zero in-plane momentum, accompanied by a nonlinear increase in the emission intensity and a sudden drop of the line width. In contrast to conventional lasing, we find a strong increase in threshold when decreasing the temperature, which can be explained by the peculiar thermalization properties. Single-shot measurements of the emission spectrum allow studying single realizations of the condensate, giving access to non-averaged properties from each individual condensation process. Our approach demonstrates a radically simplified route to investigate Bose-Einstein condensation physics at ambient conditions with easy-to-process non-crystalline materials.

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