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arxiv: 1609.05717 · v2 · pith:ZXHSHNLX · submitted 2016-09-19 · cond-mat.quant-gas

Macroscopic Two-Dimensional Polariton Condensates

Dario Ballarini , Davide Caputo , Carlos S\'anchez Mu\~noz , Milena De Giorgi , Lorenzo Dominici , Marzena H. Szyma\'nska , Kenneth West , Loren N. Pfeiffer
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Giuseppe Gigli Fabrice P. Laussy Daniele Sanvitto
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classification cond-mat.quant-gas
keywords polaritoncondensatetwo-dimensionalareabackflowballisticallycondensatescondenses
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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/{\mu}m^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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