Ballistic Thermal Conduction across Acoustically Mismatched Solid Junctions
Abstract
We derive expressions for energy flow in terms of lattice normal mode coordinates and energy transmission involving reduced group velocities. With a version of Landauer formula appropriate for lattice dynamic approach, the phonon transmission coefficients and thermal conductance are calculated for two kinds of acoustically mismatched junctions: different chirality nanotubes (11,0) to (8,0), and Si-Ge superlattice structure. Our calculation shows a mode-dependent transmission in nanotube junction and a resonantly modulated ballistic thermal conductance in superlattice. The superlattice result suggests a new interpretation of the experimental data. Our approach provides an atomistic way for the calculation of thermal conduction in nanostructure.
Keywords
Cite
@article{arxiv.cond-mat/0505401,
title = {Ballistic Thermal Conduction across Acoustically Mismatched Solid Junctions},
author = {Jian Wang and Jian-Sheng Wang},
journal= {arXiv preprint arXiv:cond-mat/0505401},
year = {2007}
}
Comments
4 pages with 4 figures