Homogeneous nonequilibrium molecular dynamics method for heat transport and spectral decomposition with many-body potentials

作     者：Zheyong Fan Haikuan Dong Ari Harju Tapio Ala-Nissila 

作者机构：School of Mathematics and Physics Bohai University Jinzhou 121000 China QTF Centre of Excellence Department of Applied Physics Aalto University FI-00076 Aalto Finland Centre for Interdisciplinary Mathematical Modelling and Department of Mathematical Sciences Loughborough University Loughborough Leicestershire LE11 3TU United Kingdom 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2019年第99卷第6期

页      面：064308-064308页

核心收录：

基　　金：National Natural Science Foundation of China, NSFC, (11404033) Academy of Finland, (312298) 

主　　题：Classical transport Lattice thermal conductivity Molecular dynamics 

摘      要：The standard equilibrium Green–Kubo and nonequilibrium molecular dynamics (MD) methods for computing thermal transport coefficients in solids typically require relatively long simulation times and large system sizes. To this end, we revisit here the homogeneous nonequilibrium MD method by Evans [Phys. Lett. A 91, 457 (1982)] and generalize it to many-body potentials that are required for more realistic materials modeling. We also propose a method for obtaining spectral conductivity and phonon mean-free path from the simulation data. This spectral decomposition method does not require lattice dynamics calculations and can find important applications in spatially complex structures. We benchmark the method by calculating thermal conductivities of three-dimensional silicon, two-dimensional graphene, and a quasi-one-dimensional carbon nanotube and show that the method is about one to two orders of magnitude more efficient than the Green–Kubo method. We apply the spectral decomposition method to examine the long-standing dispute over thermal conductivity convergence vs divergence in carbon nanotubes.