Robustness and observability of rotating vortex lattices in an exciton-polariton condensate

Magnus Borgh, Guido Franchetti, Jonathan Keeling, Natalia Berloff

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24 Citations (Scopus)
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Exciton-polariton condensates display a variety of intriguing pattern-forming behaviors, particularly when confined in potential traps. It has previously been predicted that triangular lattices of vortices of the same sign will form spontaneously as the result of surface instabilities in a harmonic trap. However, natural disorder, deviation of the external potential from circular symmetry, or higher-order terms modifying the dynamical equations may all have detrimental effects and destabilize the circular trajectories of vortices. Here we address these issues, by characterizing the robustness of the vortex lattice against disorder and deformations of the trapping potential. Since most experiments use time integrated measurements it would be hard to observe directly the rotating vortex lattices or distinguish them from vortex-free states. We suggest how these difficulties can be overcome and present an experimentally viable interference-imaging scheme that would allow the detection of rotating vortex lattices.
Original languageEnglish
Article number035307
Number of pages11
JournalPhysical Review. B, Condensed matter and materials physics
Issue number3
Publication statusPublished - 9 Jul 2012


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