Effect of substrate modes on thermal transport in supported graphene

Details Effect of substrate modes on thermal transport in supported graphene Effect of substrate modes on thermal transport in supported graphene

2011-01-12

arxiv.org/abs/1101.2463v3

Phys. Rev. B 84, 075471 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

20 pages, 5 figures

Scientific paper

10.1103/PhysRevB.84.075471

We examine thermal transport in graphene supported on SiO2 using molecular dynamics simulations. Coupling to the substrate reduces the thermal conductivity (TC) of supported graphene by an order of magnitude, due to damping of the flexural acoustic (ZA) phonons. However, increasing the strength of the graphene-substrate interaction enhances the TC of supported graphene, contrary to expectations. The enhancement is due to the coupling of graphene ZA modes to the substrate Rayleigh waves, which linearizes the dispersion and increases the group velocity of the hybridized modes. These findings suggest that the TC of two-dimensional supported graphene is tunable through surface interactions, providing a novel possibility for controlled energy flow in nanomaterials.

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