Violation of Fourier's Law and Anomalous Heat Diffusion in Silicon

Details Violation of Fourier's Law and Anomalous Heat Diffusion in Silicon Violation of Fourier's Law and Anomalous Heat Diffusion in Silicon

2010-02-18

arxiv.org/abs/1002.3419v1

Physics

Condensed Matter

Materials Science

18 pages, 4 figures. This paper is accepted for publication in Nano Today (accepted in Feb. 2010)

Scientific paper

We study heat conduction and diffusion in silicon nanowires (SiNWs) systematically by using non-equilibrium molecular dynamics. It is found that the thermal conductivity of SiNWs diverges with the length, even when the length is up to 1,100 nm which is much longer than the phonon mean free path. Moreover, an anomalous heat diffusion is observed which is believed to be responsible for the length dependent thermal conductivity. Our results provide strong evidence that Fourier's law of heat conduction is not valid in low dimensional nanostructures.

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