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Title: Violation of Fourier's law and anomalous heat diffusion in silicon nanowires
Authors: Yang, N. 
Zhang, G.
Li, B. 
Keywords: Heat conduction
Heat diffusion
Low-dimensional system
Issue Date: Apr-2010
Citation: Yang, N., Zhang, G., Li, B. (2010-04). Violation of Fourier's law and anomalous heat diffusion in silicon nanowires. Nano Today 5 (2) : 85-90. ScholarBank@NUS Repository.
Abstract: We study heat conduction and diffusion in silicon nanowires (SiNWs) systematically by using non-equilibrium molecular dynamics. It is found that the thermal conductivity (κ) of SiNWs diverges with the length as, κ ∝ Lβ, even when the length is up to 1.1 μm which is much longer than the phonon mean free path. The dependences of β on temperature and length are also discussed. 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. © 2010 Elsevier Ltd. All rights reserved.
Source Title: Nano Today
ISSN: 17480132
DOI: 10.1016/j.nantod.2010.02.002
Appears in Collections:Staff Publications

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