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arXiv · 1609.05717

Macroscopic Two-Dimensional Polariton Condensates

Dario Ballarini·Davide Caputo·Carlos Sánchez Muñoz·Milena De Giorgi·Lorenzo Dominici·Marzena H. Szymańska·Kenneth West·Loren N. Pfeiffer·Giuseppe Gigli·Fabrice P. Laussy·Daniele Sanvitto
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Abstract

We report a record-size, two-dimensional polariton condensate of a fraction of a millimeter radius free from the presence of an exciton reservoir. This macroscopically occupied state is formed by the ballistically expanding polariton flow that relaxes and condenses over a large area outside of the excitation spot. The density of this trap-free condensate is < 1 polariton/μm^2, reducing the phase noise induced by the interaction energy. Moreover, the backflow effect, recently predicted for the nonparabolic polariton dispersion, is observed here for the first time in the fast-expanding wave packet.

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Dario Ballarini, Davide Caputo, Carlos Sánchez Muñoz, Milena De Giorgi, Lorenzo Dominici, Marzena H. Szymańska, Kenneth West, Loren N. Pfeiffer, Giuseppe Gigli, Fabrice P. Laussy, Daniele Sanvitto. 2021-04-12. Macroscopic Two-Dimensional Polariton Condensates. https://doi.org/10.1103/physrevlett.118.215301

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