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Heat conduction mechanisms in superlattices could be different acrossdifferent types of interfaces. Van der Waals superlattices are structuresphysically assembled through weak van der Waals interactions by design, and mayhost properties beyond the traditional limits of lattice matching andprocessing compatibility, offering new types of interfaces. In this work,natural van der Waals (SnS)1.17(NbS2)n superlattices are synthesized, and theirthermal conductivities are measured by time-domain thermoreflectance as afunction of interface density. Our results show that heat conduction of(SnS)1.17(NbS2)n superlattices is dominated by interface scattering when thecoherent length of phonons is larger than the superlattice period, indicatingincoherent phonon transport dominates cross-plane heat conduction in van derWaals superlattices even when the period is atomically thin and abrupt.Moreover, our result suggests that the widely accepted heat conductionmechanism for conventional superlattices that coherent phonons dominate whenthe period is short, is not applicable due to symmetry breaking in most van derWaals superlattices. Our findings provide new insight for understanding thethermal behavior of van der Waals superlattices, and devise approaches foreffective thermal management of superlattices depending on the distinct typesof interfaces.

Incoherent phonon transport dominates heat conduction across van der Waals superlattices