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Effect of interactions on vortices in a nonequilibrium polariton condensate

Krizhanovskii, D.N., Whittaker, D.M., Bradley, R.A., Guda, K., Sarkar, D., Vina, L., Cerda, E., Santos, P., Biermann, K., Hey, R. and Skolnick, M.S. (2010) Effect of interactions on vortices in a nonequilibrium polariton condensate. Physical Review Letters , 104 (12). Art no.126402 . ISSN 0031-9007

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We demonstrate the creation of vortices in a macroscopically occupied polariton state formed in a semiconductor microcavity. A weak external laser beam carrying orbital angular momentum (OAM) is used to imprint a vortex on the condensate arising from the polariton optical parametric oscillator (OPO). The vortex core radius is found to decrease with increasing pump power, and is determined by polariton-polariton interactions. As a result of OAM conservation in the parametric scattering process, the excitation consists of a vortex in the signal and a corresponding antivortex in the idler of the OPO. The experimental results are in good agreement with a theoretical model of a vortex in the polariton OPO.

Item Type: Article
Copyright, Publisher and Additional Information: © 2010 American Physical Society. This is an author produced version of a paper subsequently published in Physical Review Letters. Uploaded in accordance with the publisher's self-archiving policy.
Keywords: Bose-Einstein Condensation; Semiconductor Microcavities
Institution: The University of Sheffield
Academic Units: The University of Sheffield > Faculty of Science (Sheffield) > Department of Physics and Astronomy (Sheffield)
Depositing User: Miss Anthea Tucker
Date Deposited: 14 May 2010 09:03
Last Modified: 08 Feb 2013 17:00
Published Version: http://dx.doi.org/10.1103/PhysRevLett.104.126402
Status: Published
Publisher: American Physical Society
Identification Number: 10.1103/PhysRevLett.104.126402
URI: http://eprints.whiterose.ac.uk/id/eprint/10826

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