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Ballistic Thermal Conduction across Acoustically Mismatched Solid Junctions | | Jian Wang
; Jian-Sheng Wang
; | | Date: |
17 May 2005 | | Subject: | Statistical Mechanics | cond-mat.stat-mech | | 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. | | Source: | arXiv, cond-mat/0505401 | | Services: | Forum | Review | PDF | Favorites | |
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