A coherent phonon pulse model for transient phonon thermal transport

作者：Chen Xiang^*; Chernatynskiy Aleksandr; Xiong Liming; Chen Youping

来源：Computer Physics Communications, 2015, 195: 112-116.

DOI：10.1016/j.cpc.2015.05.008

• Computational model
• Coherent phonons
• Ultrashort laser pulse
• Transient phonon transport

In this work, we present a novel heat source model, the coherent phonon pulse (CPP), composed of spatiotemporal Gaussian wave packets to mimic the coherent excitation of a non-equilibrium phonon population by ultrashort laser techniques, for the study of transient phonon thermal transport. Through molecular dynamic simulations of phonon transport in bicrystalline silicon-nanowires containing Sigma 3 and Sigma 19 grain-boundaries (GBs), we demonstrate that the new model facilitates not only a quantitative measurement of phonon-interface scattering, but also a mechanistic understanding of the highly non-equilibrium process of phonon transport with the coherent wave nature being preserved.

• 出版日期2015-10