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Assessing the Validity of Quantum Corrections to Molecular Dynamics Simulations of Bulk Silicon

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Abstract:

Thermal conductivities of bulk silicon are calculated by equilibrium molecular dynamics (MD) simulations. Applying common used quantum corrections to the MD results, does not bring them into better agreement with the theoretical predictions or experimental data, while the uncorrected values are closer to the theoretical predictions and experiments below 400K. By assessing the validity of quantum corrections according to theoretical calculations and MD simulations, we demonstrate that the hypothesis of equating the heat fluxes is not reliable. In addition, we explore that the rations of thermal conductivities of MD simulations and quantum calculations are approximate to 1. Then a modified quantum correction for mapping MD simulations to quantum systems is proposed.

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Periodical:

Key Engineering Materials (Volume 483)

Pages:

653-657

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.483.653

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Online since:

June 2011

Authors:

Qi Ming Zhou, Ke Dong Bi, Yun Fei Chen

Keywords:

Bulk Silicon, Molecular Dynamic Simulation, Quantum Correction, Thermal Conductivity (TC)

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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