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On the Speed and Relaxation Time of Heat Transport Induced by Ultra-Short Laser Pulses in Graphene
Janina Marciak-Kozlowska, Magdalena Pelc and Miroslaw Kozlowski

We report studies on the solution of the Heaviside-Klein-Gordon thermal equation. As the result shows the solution consists of two components: the fast thermal wave and the slow diffusion of a very large time period compared to relaxation time. We argue that the fast thermal wave can be recognized as an indication of the ballistic heat transport. We consider, as an example, the ballistic heat transport in graphene.

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