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Observation of all-optical Berezinskii-Krosterlitz-Thouless crossover in a photonic lattice

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Abstract

We experimentally observe an all-optical Berezinskii-Kosterlitz-Thouless transition, in which vortices spontaneously appear due to nonlinear interactions. We show that the number of vortices and their correlations agree with predictions from mean-field theory.

© 2012 Optical Society of America

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