We theoretically demonstrate soliton steering in P Tsymmetric coupled nonlinear dimers. We show that if the length of the P T -symmetric system is set to 2π contrary to the conventional one which operates satisfactorily well only at the half-beat coupling length, the P T dimer remarkably yields an ideal soliton switch exhibiting almost 99.99% energy efficiency with an ultralow critical power.

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Following the concept of P T -symmetric couplers, we propose a linearly coupled system of nonlinear waveguides, made of positive-and negative-index materials, which carry, respectively, gain and loss. We report novel bi-and multi-stability states pertaining to transmitted and reflective intensities, which are controlled by the ratio of the gain and loss coefficients, and phase mismatch between the waveguides. These states offer transmission regimes with extremely low threshold intensities for transitions between coexisting states, and very large amplification ratio between the input and output intensities leading to an efficient way of controlling light with light.