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Effect of interactions on vortices in a nonequilibrium polariton condensate

By D.N. Krizhanovskii, D.M. Whittaker, R.A. Bradley, K. Guda, D. Sarkar, L. Vina, E. Cerda, P. Santos, K. Biermann, R. Hey and M.S. Skolnick

Abstract

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

Publisher: American Physical Society
Year: 2010
OAI identifier: oai:eprints.whiterose.ac.uk:10826

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