title: Saddle solitons: a balance between bi-diffraction and hybrid nonlinearity.
abstract: We demonstrate self-trapping of light by simultaneously compensating normal and anomalous (saddle-shaped) diffractions with self-focusing and self-defocusing hybrid nonlinearity in optically induced ionic-type photonic lattices. Innovative two-dimensional gap solitons, named "saddle solitons," are established, whose phase and spectrum characteristics are different from all previously observed spatial solitons.
authors.affiliation: The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education and TEDA Applied Physics School, Nankai University, Tianjin 300457, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Hu
authors.forename: Cibo
authors.initials: C
authors.lastname: Lou
authors.forename: Peng
authors.initials: P
authors.lastname: Zhang
authors.forename: Jingjun
authors.initials: J
authors.lastname: Xu
authors.forename: Jianke
authors.initials: J
authors.lastname: Yang
authors.forename: Zhigang
authors.initials: Z
authors.lastname: Chen