Stability of an interconnected Schrödinger–heat system in a torus region

In this paper, we study the exponential stability of a two‐dimensional Schrödinger–heat interconnected system in a torus region, where the interface between the Schrödinger equation and the heat equation is of natural transmission conditions. By using a polar coordinate transformation, the two‐dimensional interconnected system can be reformulated as an equivalent one‐dimensional coupled system. It is found that the dissipative damping of the whole system is only produced from the heat part, and hence, the heat equation can be considered as an actuator to stabilize the whole system. By a detailed spectral analysis, we present the asymptotic expressions for both eigenvalues and eigenfunctions of the closed‐loop system, in which the eigenvalues of the system consist of two branches that are asymptotically symmetric to the line Reλ =? Imλ. Finally, we show that the system is exponentially stable and the semigroup, generated by the system operator, is of Gevrey class δ > 2. Copyright © 2016 John Wiley & Sons, Ltd.