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We use computer simulations to study the morphology and rheologicalproperties of a bidimensional emulsion resulting from a mixture of a passiveisotropic fluid and an active contractile polar gel, in the presence of asurfactant that favours the emulsification of the two phases. By varying theintensity of the contractile activity and of an externally imposed shear flow,we find three possible morphologies. For low shear rates, a simple lamellarstate is obtained. For intermediate activity and shear rate, an asymmetricstate emerges, which is characterized by shear and concentration banding at thepolar/isotropic interface. A further increment in the active forcing leads tothe self-assembly of a soft channel where an isotropic fluid flows between twolayers of active material. We characterize the stability of this state byperforming a dynamical test varying the intensity of the active forcing andshear rate. Finally, we address the rheological properties of the system bymeasuring the effective shear viscosity, finding that this increases as activeforcing is increased, so that the fluid thickens with activity.

Soft channel formation and symmetry breaking in exotic active emulsions