Dark solitons in dispersive quadratic media.

@article{Buryak1995DarkSI,
  title={Dark solitons in dispersive quadratic media.},
  author={Alexander V. Buryak and Yuri S. Kivshar},
  journal={Optics letters},
  year={1995},
  volume={20 8},
  pages={
          834-6
        }
}
We analyze dark solitons supported by second-order parametric interactions between the fundamental and second harmonics in the presence of dispersion and group-velocity mismatch. We reveal various types of solitary waves, including a family of two-wave dark solitons propagating on a modulationally stable background, dark solitons with nonmonotonic tails, and bound states of dark solitons. 
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