Enhancing the ballistic thermal transport of silicene through smooth interface coupling
CY Chen and YC She and HP Xiao and JW Ding and JX Cao and ZX Guo, JOURNAL OF PHYSICS-CONDENSED MATTER, 28, 145003 (2016).
We have performed nonequilibrium molecular dynamics calculations on the length (L) dependence of thermal conductivity (K) of silicene both supported on and sandwiched between the smooth surfaces, i.e. h-BN, at room temperature. We find that K of silicene follows a power law K proportional to L-beta with beta increasing from about 0.3-0.4 under the effect of interface coupling, showing an enhancement of the ballistic thermal transport of silicene. We also find that beta can be further increased to about 0.6 by increasing the interface coupling strength for the silicene sandwiched between h-BN. The increase of beta for the supported case is found to come from the variation of the flexural acoustic (ZA) phonon mode and the first optical phonon mode induced by the substrate, whereas the unusual increase of beta for the sandwiched case is attributed to the increment of velocities of all three acoustic phonon modes. These findings provide an interesting route for manipulating the ballistic energy flow in nanomaterials.
Return to Publications page