title: Convection-induced nonlinear symmetry breaking in wave mixing.
abstract: We show that the combined action of diffraction and convection (walk-off) in wave mixing processes leads to a nonlinear symmetry breaking in the generated traveling waves. The dynamics near to threshold is reduced to a Ginzburg-Landau model, showing an original dependence of the nonlinear self-coupling term on the convection. Analytical expressions of the intensity and velocity of traveling waves emphasize the utmost importance of convection in this phenomenon. These predictions are in excellent agreement with the numerical solutions of the full dynamical model.
authors.affiliation: Department of Physics, University of Strathclyde, Glasgow, G4 0NG, United Kingdom.
authors.forename: Roberta
authors.initials: R
authors.lastname: Zambrini
authors.forename: Maxi
authors.initials: M
authors.lastname: San Miguel
authors.forename: Céline
authors.initials: C
authors.lastname: Durniak
authors.forename: Majid
authors.initials: M
authors.lastname: Taki