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arXiv · 2302.12216

Is Thermal Conductivity of Graphene Divergent and Higher Than Diamond?

Zherui Han·Xiulin Ruan
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Abstract

The thermal conductivity of monolayer graphene is an outstanding challenge with no consensus reached on its exact value and length convergence so far. We consider four-phonon scattering, phonon renormalization, and an exact solution to phonon Boltzmann transport equation (BTE) from first principles. Using this computational formalism with unprecedented sampling grid, we show that when four-phonon scattering is included the thermal conductivity is convergent with system size at a room temperature value of 1300 W/(m$\cdot$K), which is lower than that of diamond. On the contrary, considering three-phonon scattering only yields divergence with size due to the momentum-conserving normal processes of flexural phonons.

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Zherui Han, Xiulin Ruan. 2023-02-23. Is Thermal Conductivity of Graphene Divergent and Higher Than Diamond?. https://doi.org/10.1103/physrevb.108.l121412

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