Nontrivial phase coupling in polariton multiplets

H. Ohadi, R. L. Gregory, T. Freegarde, Y. G. Rubo, A. V. Kavokin, N. G. Berloff*, P. G. Lagoudakis

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

55 Citations (Scopus)
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Abstract

We investigate the phase coupling between spatially separated polariton condensates under nonresonant optical pulsed excitation. In the simple case of two condensates, we observe phase locking either in symmetric or antisymmetric states. We demonstrate that the coupling symmetry depends both on the separation distance and outflow velocity from the condensates. We interpret the observations through stimulated relaxation of polaritons to the phase configuration with the highest occupation. We derive an analytic criterion for the phase locking of a pair-polariton condensate and extend it to polariton multiplets. In the case of three condensates, we predict theoretically and observe experimentally either in-phase locking or the appearance of phase winding with phase differences of ±2π/3 between neighbors. The latter state corresponds to a vortex of winding number ±1 across the three polariton condensates.

Original languageEnglish
Article number031032
Number of pages9
JournalPhysical Review X
Volume6
Issue number3
DOIs
Publication statusPublished - 26 Aug 2016

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