Abstract:
In this study, we perform non-equilibrium molecular dynamics simulations to investigate phonon heat
transport in a two-dimensional superlattice with equal-sized domains of graphene and phagraphene. Ef fects on conductivity are examined in relation to modifications of domain sizes, the length of employed
nanoribbons and temperature differences between the thermal baths used with the superlattices. We
have determined that effective thermal conductivity reaches a minimum value of 155 W/mK for ribbons
with a superlattice period of 12.85 nm. This minimum thermal conductivity of graphene-phagraphene
superlattices at infinite length is approximately 5%, of pure graphene thermal conductivity, and ≈ 50% of
phagraphene thermal conductivity. Minimum thermal conductivity occurs at the transition from coherent
to incoherent phonon transport, where the superlattice period is comparable to the phonon coherence
length