Stationary fronts in an A + B --> 0 reaction under subdiffusion.

We consider stationary profiles of reactants' concentrations and of reaction zones of an A + B --> 0 reaction in a flat subdiffusive medium fed by reactants of both types on both sides. The structures formed under such conditions differ strikingly from those in simple diffusion and exhibit accumulation and depletion zones close to the boundaries and nonmonotonic behavior of the reaction intensity with respect to the reactants' concentrations at the boundaries. These findings are connected to an effectively nonlinear character of transport in subdiffusive systems under reactions.