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arXiv · 1810.08489

Self-trapping of exciton-polariton condensates

Dario Ballarini·Igor Chestnov·Davide Caputo·Milena De Giorgi·Lorenzo Dominici·Kenneth West·Loren N. Pfeiffer·Giuseppe Gigli·Alexey Kavokin·Daniele Sanvitto
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Abstract

The self-trapping of exciton-polariton condensates is demonstrated and explained by the formation of a new polaron-like state. Above the polariton lasing threshold, local variation of the lattice temperature provides the mechanism for an attractive interaction between polaritons. Due to this attraction, the condensate collapses into a small bright spot. Its position and momentum variances approach the Heisenberg quantum limit. The self-trapping does not require either a resonant driving force or a presence of defects. The trapped state is stabilized by the phonon-assisted stimulated scattering of excitons into the polariton condensate. While the formation mechanism of the observed self-trapped state is similar to the Landau-Pekar polaron model, this state is populated by several thousands of quasiparticles, in a strike contrast to the conventional single-particle polaron state.

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Dario Ballarini, Igor Chestnov, Davide Caputo, Milena De Giorgi, Lorenzo Dominici, Kenneth West, Loren N. Pfeiffer, Giuseppe Gigli, Alexey Kavokin, Daniele Sanvitto. 2018-10-19. Self-trapping of exciton-polariton condensates. https://doi.org/10.1103/physrevlett.123.047401

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