Interlayer Coupling of Heat Transport in Suspended Graphene

Graphene is now in spotlight due to excellent physical properties. Due to the extremely small thickness of the monolayer graphene, if the excellent physical properties are maintained regardless of the system size in the field has been a key question for practical applications. Here, we investigate the thermal conduction in few-layer graphene suspended over holes with specified diameter and try to answer the question in terms of the phonon transport. Our results show that the graphene with 2 or more layers shows characteristics of bulk materials in terms of thermal conduction and that the interlayer coupling must be the key mechanism yielding the intrinsic property.