  In a recent study of chaos synchronization in symmetric complex networks
[Pecora \textit{et al}., Nat. Commun. {\bf 5}, 4079 (2014)], it is found that
stable synchronous clusters may coexist with many non-synchronous nodes in the
asynchronous regime, resembling the chimera state observed in regular networks
of non-locally coupled periodic oscillators. Although of practical
significance, this new type of state, namely the chimera-synchronization state,
is hardly generated for the general complex networks, due to either the
topological instabilities or the weak coupling strength. Here, based on the
strategy of pinning coupling, we propose an effective method for inducing
chimera-synchronization in symmetric complex network of coupled chaotic
oscillators. We are able to argue mathematically that, by pinning a group of
nodes satisfying permutation symmetry, there always exits a critical pinning
strength beyond which the unstable chimera-synchronization states can be
successfully induced. The feasibility and efficiency of the control method are
verified by numerical simulations of both artificial and real-world complex
networks, with the numerical results well fitted by the theoretical
predictions.
