Experimental observations of synchronization interfaces in networks of oscillators

In complex networks, beyond the appearance of a global synchronized state, cases in which clusters of synchronized nodes form can also be observed. In such cases, a specific dynamical behavior in the nodes constituting the interface between clusters of synchronized units is obtained. In this paper, a network of nonlinear circuits is investigated with the aim of giving experimental evidences of the behavior of interface nodes oscillating with an instantaneous frequency varying in time between those of the network communities.