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

Research output: Contribution to journalArticlepeer-review

43 Scopus citations


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/μm2, 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.

Original languageEnglish (US)
Article number215301
JournalPhysical review letters
Issue number21
StatePublished - May 26 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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