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Nonlinear breaking of PT symmetry in coupled waveguides with balanced gain and loss

Andrey A. Sukhorukov, Zhiyong Xu, and Yuri S. Kivshar

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Abstract

We predict that in coupled waveguides with balanced gain and loss, featuring stationary PT-symmetric modes in the linear regime, nonlinearity results in symmetry breaking above a critical power threshold, leading to sharp beam switching.

© 2010 Optical Society of America

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