Simulating Thermal Transport in Nanostructures from the Ballistic to the Diffusive Regime
Автор: NCSAatIllinois
Загружено: 2015-06-04
Просмотров: 3818
"Simulating Thermal Transport in Nanostructures from the Ballistic to the Diffusive Regime" -- Elif Ertekin, University of Illinois at Urbana-Champaign
With the help of the Blue Waters petascale supercomputer, we have been able to simulate thermal transport in nanoscale materials such as graphene and the newly-synthesized carbon nanothreads. Our simulations scan across orders of magnitude of length scales from the ballistic towards the diffusive transport regime. The nature of thermal transport in these low dimensional materials has been the subject of immense research controversy for the last several years. Several analytical models predict that the thermal conductivity of these materials will diverge without bound with increasing sample size. However, it is typically very difficult to directly confirm these predictions, as the large phonon mean free paths necessitate the simulation of systems of prohibitively large size. Our molecular dynamics results on the nature of phonon transport in graphene and in carbon nanothreads (one and two –dimensional materials) reveal a markedly different asymptotic nature of the transport for the two systems.
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