A Coherent Phonon Pulse Model for Transient Phonon Thermal Transport

Abstract

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 Σ3 and Σ19 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.

Department(s)

Physics

Research Center/Lab(s)

Center for High Performance Computing Research

Keywords and Phrases

Coherent Scattering; Grain Boundaries; Laser Excitation; Molecular Dynamics; Nanowires; Ultrashort Pulses; Coherent Excitations; Coherent Phonons; Computational Model; Gaussian Wave Packets; Non-Equilibrium Process; Phonon Thermal Transport; Phonon Transport; Quantitative Measurement; Phonons; Transient Phonon Transport; Ultrashort Laser Pulse

International Standard Serial Number (ISSN)

0010-4655

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2015 Elsevier, All rights reserved.

Publication Date

01 Oct 2015

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