Heat conduction in simple networks: the effect of interchain coupling.

Heat conduction in simple networks consisting of different one dimensional nonlinear chains is studied. We find that the coupling between chains has a different function in heat conduction from that in electric network (circuit). The two coupled particles form an interface and introduce an interface thermal resistance which reduces the heat current. The reduction of heat current depends sensitively on the position and strength of the coupling. This might find application in controlling heat flow in complex networks.