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arXiv · 1510.05802

Effect of Stone-Wales defects on the thermal conductivity of graphene

S. E. Krasavin·V. A. Osipov
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Abstract

The problem of phonon scattering by strain fields caused by Stone-Wales (SW) defects in graphene is studied in the framework of the deformation potential approach. An explicit form of the phonon mean free path due to phonon-SW scattering is obtained within the Born approximation. The mean free path demonstrates a specific $q$-dependence varying as $q^{-3}$ at low wavevectors and taking a constant value at large $q$. The thermal conductivity of graphene nanoribbons (GNRs) is calculated with the three-phonon umklapp, SW and rough edge scatterings taken into account. A pronounced decrease of the thermal conductivity due to SW defects is found at low temperatures whereas at room temperatures and above the phonon-phonon umklapp scattering becomes dominant. A comparison with the case of vacancy defects shows that they play more important role in the reduction of the thermal conductivity in GNRs over a wide temperature range.

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S. E. Krasavin, V. A. Osipov. 2015-10-20. Effect of Stone-Wales defects on the thermal conductivity of graphene. https://doi.org/10.1088/0953-8984%2F27%2F42%2F425302

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