Travelling-stripe forcing of Turing patterns

We report on the effect of a spatio-temporal forcing applied on Turing stripe patterns under spatial resonance. Experiments conducted with the photosensitive CDIMA reaction unveil a large variety of dynamical responses of striped patterns, from entrained to waving, when changing the forcing velocity from small to large values. In between, and quite unexpectedly, we also observe a symmetry breaking phenomenon leading to hexagonal lattices, either entrained with the forcing or oscillating. We propose a new set of coupled amplitude equations [1] which provides a theoretical framework where the experimental phenomena can be interpreted.