title: Surface dark screening solitons.
abstract: We report on the existence of surface dark screening solitons at the interface between a dielectric medium (air) and a self-defocusing nonlinear material, taking advantage of photorefractive diffusion and drift nonlinearities. It is very interesting that a surface dark soliton is just like half of a dark soliton in bulk, but not a whole dark soliton propagating along surface. The excitation, propagation, and stability of this type of soliton are studied by using the beam-propagation method. Another interesting thing is that this type of dark soliton can be excited by a planar light beam without a necessary dark notch.
authors.affiliation: Photonics Research Center, the MOE Key Laboratory of Weak-Light Nonlinear Photonics, Nankai University, Tianjin 300071, China.
authors.forename: W Q
authors.initials: WQ
authors.lastname: Chen
authors.forename: X
authors.initials: X
authors.lastname: Yang
authors.forename: S Y
authors.initials: SY
authors.lastname: Zhong
authors.forename: Z
authors.initials: Z
authors.lastname: Yan
authors.forename: T H
authors.initials: TH
authors.lastname: Zhang
authors.forename: J G
authors.initials: JG
authors.lastname: Tian
authors.forename: J J
authors.initials: JJ
authors.lastname: Xu