  We study thermal transport in folded graphene nanoribbons using molecular
dynamics simulations and the non-equilibrium Green's function method. It is
found that the thermal conductivity of flat graphene nanoribbons can be
modulated by folding and changing interlayer couplings. The analysis of
transmission reveals that the reduction of thermal conductivity is due to
scattering of low frequency phonons by the folds. Our results suggest that
folding can be utilized in the modulation of thermal transport properties in
graphene and other two dimensional materials.
