Solitons and decoherence in left-handed metamaterials
  We present exact electromagnetic solitary pulses that can be experimentally obtained within nonlinear left-handed metamaterials. The effect of pulse decoherence on the modulation instability of partially incoherent electromagnetic waves is also investigated. The results may contribute to a better understanding of nonlinear electromagnetic pulse propagation in media with negative index of refraction. 
M. Marklund, P.K. Shukla, L. Stenflo, G. Brodin