Thermal conductance of graphene and dimerite

Details Thermal conductance of graphene and dimerite Thermal conductance of graphene and dimerite

2009-02-11

arxiv.org/abs/0902.1836v2

PhysRevB.79.205418 (2009)

Physics

Condensed Matter

Materials Science

enlarged version, in PRB

Scientific paper

10.1103/PhysRevB.79.205418

We investigate the phonon thermal conductance of graphene regarding the graphene sheet as the large-width limit of graphene strips in the ballistic limit. We find that the thermal conductance depends weakly on the direction angle $\theta$ of the thermal flux periodically with period $\pi/3$. It is further shown that the nature of this directional dependence is the directional dependence of group velocities of the phonon modes in the graphene, originating from the $D_{6h}$ symmetry in the honeycomb structure. By breaking the $D_{6h}$ symmetry in graphene, we see more obvious anisotropic effect in the thermal conductance as demonstrated by dimerite.

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