Controllability of a parabolic system with a diffusive interface

Le Rousseau, Jérôme; Léautaud, Matthieu; Robbiano, Luc

Séminaire Laurent Schwartz — EDP et applications (2011-2012), Exposé no. 17, 20 p.

We consider a linear parabolic transmission problem across an interface of codimension one in a bounded domain or on a Riemannian manifold, where the transmission conditions involve an additional parabolic operator on the interface. This system is an idealization of a three-layer model in which the central layer has a small thickness $\delta$. We prove a Carleman estimate in the neighborhood of the interface for an associated elliptic operator by means of partial estimates in several microlocal regions. In turn, from the Carleman estimate, we obtain a spectral inequality that yields the null-controllability of the parabolic system. These results are uniform with respect to the small parameter $\delta$.

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