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

Robustness and observability of rotating vortex-lattices in an exciton-polariton condensate
Robustness and observability of rotating vortex-lattices in an exciton-polariton condensate
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.
1550-235X
1-12
Borgh, Magnus O.
a3c181f8-0535-46cd-bb9a-6e930a81f86e
Franchetti, Guido
1b81b8f5-69ec-4923-98ed-61025cb1eb8c
Keeling, Jonathan
e988426b-e5d6-4cb3-bf49-bb5b97f5b3e0
Berloff, Natalia G.
de2658f8-d78b-4552-ac62-33290762b797
Borgh, Magnus O.
a3c181f8-0535-46cd-bb9a-6e930a81f86e
Franchetti, Guido
1b81b8f5-69ec-4923-98ed-61025cb1eb8c
Keeling, Jonathan
e988426b-e5d6-4cb3-bf49-bb5b97f5b3e0
Berloff, Natalia G.
de2658f8-d78b-4552-ac62-33290762b797

Borgh, Magnus O., Franchetti, Guido, Keeling, Jonathan and Berloff, Natalia G. (2012) Robustness and observability of rotating vortex-lattices in an exciton-polariton condensate. Physical Review B, 86 (35307), 1-12. (doi:10.1103/PhysRevB.86.035307).

Record type: Article

Abstract

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.

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PhysRevB.86.035307 - Version of Record
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e-pub ahead of print date: 18 April 2012
Published date: 9 July 2012
Organisations: Applied Mathematics

Identifiers

Local EPrints ID: 338818
URI: https://eprints.soton.ac.uk/id/eprint/338818
ISSN: 1550-235X
PURE UUID: b53ae5f0-66c4-4915-978d-f53746328c46

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Date deposited: 17 May 2012 12:52
Last modified: 11 Nov 2019 21:03

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