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Some critical issues in the characterization of nanoscale thermal conductivity by molecular dynamics analysis

Research paper by Mohammad Ehsan Khaled, Liangchi Zhang Weidong Liu

Indexed on: 08 Jun '18Published on: 07 May '18Published in: Modelling and Simulation in Materials Science and Engineering



Abstract

The nanoscale thermal conductivity of a material can be significantly different from its value at the macroscale. Although a number of studies using the equilibrium molecular dynamics (EMD) with Green–Kubo (GK) formula have been conducted for nano-conductivity predictions, there are many problems in the analysis that have made the EMD results unreliable or misleading. This paper aims to clarify such critical issues through a thorough investigation on the effect and determination of the vital physical variables in the EMD-GK analysis, using the prediction of the nanoscale thermal conductivity of Si as an example. The study concluded that to have a reliable prediction, quantum correction, time step, simulation time, correlation time and system size are all crucial.