J Belmonte-Beitia and J Cuevas (pdf copy 282 Kb)
In this paper, we give a proof of the existence of stationary dark soliton solutions or heteroclinic orbits of nonlinear equations of Schrödinger type with periodic inhomogeneous nonlinearity. The result is illustrated with examples of dark solitons for cubic and photorefractive nonlinearities.
J. Math. Phys. 52:032702, March 2011; doi:10.1063/1.3559118