Spectral Method for Thermal Conductivity Calculations |
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Authors: | Ju Li |
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Affiliation: | (1) Department of Materials Science and Engineering, Ohio State University, Columbus, OH 43210, USA |
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Abstract: | We discuss several post-processing issues in molecular dynamics (MD) calculation of lattice thermal conductivity using the
Green–Kubo formula. For crystals with high thermal conductivity such as SiC, converting the MD raw data on heat current fluctuations
into thermal conductivity result is non-trivial. One can accelerate the process using Fast Fourier Transform and the spectral
method. A few mathematical subtleties are cleared up. Due to finite data length, integration of the correlation function must
be terminated before noise takes over; two termination criteria are proposed which give reasonable results for crystalline
β-SiC. A simple solvable model that illustrates the above points and can be used for code-checking is presented. |
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Keywords: | Correlation function Exponential fitting (EF) First-dip (FD) termination Power spectrum Termination criterion |
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